diff --git a/administration/src/bp-modules/cards/AddCardForm.tsx b/administration/src/bp-modules/cards/AddCardForm.tsx
index fbd005edf..4ae634c4f 100644
--- a/administration/src/bp-modules/cards/AddCardForm.tsx
+++ b/administration/src/bp-modules/cards/AddCardForm.tsx
@@ -28,6 +28,8 @@ const AddCardForm = ({ card, onRemove, updateCard }: CreateCardsFormProps): Reac
   const today = PlainDate.fromLocalDate(new Date())
   const { t } = useTranslation('cards')
 
+  console.log(card)
+
   return (
     <UiCard>
       <CardHeader>
diff --git a/administration/src/bp-modules/cards/CreateCardsButtonBar.tsx b/administration/src/bp-modules/cards/CreateCardsButtonBar.tsx
index 2a5537f67..f7e9be613 100644
--- a/administration/src/bp-modules/cards/CreateCardsButtonBar.tsx
+++ b/administration/src/bp-modules/cards/CreateCardsButtonBar.tsx
@@ -19,8 +19,8 @@ const CreateCardsButtonBar = ({
   generateCardsCsv,
   goBack,
 }: CreateCardsButtonBarProps): ReactElement => {
-  const allCardsValid = cards.every(card => isValid(card))
-  const { csvExport } = useContext(ProjectConfigContext)
+  const { csvExport, card: cardConfig } = useContext(ProjectConfigContext)
+  const allCardsValid = cards.every(card => isValid(card, cardConfig))
   const { t } = useTranslation('cards')
 
   return (
diff --git a/administration/src/bp-modules/cards/ImportCardsInput.test.tsx b/administration/src/bp-modules/cards/ImportCardsInput.test.tsx
index 9593103a0..cfa3b2c2c 100644
--- a/administration/src/bp-modules/cards/ImportCardsInput.test.tsx
+++ b/administration/src/bp-modules/cards/ImportCardsInput.test.tsx
@@ -2,6 +2,7 @@ import { OverlayToaster } from '@blueprintjs/core'
 import { fireEvent, waitFor } from '@testing-library/react'
 import React from 'react'
 
+import { BAVARIA_CARD_TYPE_GOLD, BAVARIA_CARD_TYPE_STANDARD } from '../../cards/extensions/BavariaCardTypeExtension'
 import { Region } from '../../generated/graphql'
 import { ProjectConfigProvider } from '../../project-configs/ProjectConfigContext'
 import bayernConfig from '../../project-configs/bayern/config'
@@ -61,7 +62,7 @@ describe('ImportCardsInput', () => {
     const csv = `
 Name,Ablaufdatum,Kartentyp
 Thea Test,03.04.2024,Standard
-Tilo Traber,,Gold
+Tilo Traber,,gold
 `
     await renderAndSubmitCardsInput(projectConfig, csv, setCards)
 
@@ -70,20 +71,54 @@ Tilo Traber,,Gold
     expect(setCards).toHaveBeenCalledWith([
       {
         expirationDate: PlainDate.fromCustomFormat('03.04.2024'),
-        extensions: { bavariaCardType: 'Standard', regionId: 0 },
+        extensions: { bavariaCardType: BAVARIA_CARD_TYPE_STANDARD, regionId: 0 },
         fullName: 'Thea Test',
         id: expect.any(Number),
       },
-      { expirationDate: null, extensions: { regionId: 0 }, fullName: 'Tilo Traber', id: expect.any(Number) },
+      {
+        expirationDate: null,
+        extensions: { regionId: 0, bavariaCardType: BAVARIA_CARD_TYPE_GOLD },
+        fullName: 'Tilo Traber',
+        id: expect.any(Number),
+      },
+    ])
+  })
+
+  it('should correctly import CSV Card for bayern freinet', async () => {
+    jest.spyOn(URLSearchParams.prototype, 'get').mockReturnValue('true')
+
+    const projectConfig = bayernConfig
+    const csv = `
+inhaber_ehrenamtskarte;eak_datum;eak_karten_status;co_name;anrede;titel;vorname;nachname;strasse;plz;ort
+�Blau�;01.12.2029;Karte abgelaufen;;Herr;;Maxim;Musterin;Kirchgasse 30;97346;Iphofen
+�Gold�;;Karte an EA verschickt;;Herr;;Max;Muster;Kleinlangheimer Stra�e 12;97355;Kleinlangheim
+`
+    await renderAndSubmitCardsInput(projectConfig, csv, setCards)
+
+    expect(toaster).not.toHaveBeenCalled()
+    expect(setCards).toHaveBeenCalledTimes(1)
+    expect(setCards).toHaveBeenCalledWith([
+      {
+        expirationDate: PlainDate.fromCustomFormat('01.12.2029'),
+        extensions: { bavariaCardType: BAVARIA_CARD_TYPE_STANDARD, regionId: 0 },
+        fullName: 'Maxim Musterin',
+        id: expect.any(Number),
+      },
+      {
+        expirationDate: null,
+        extensions: { regionId: 0, bavariaCardType: BAVARIA_CARD_TYPE_GOLD },
+        fullName: 'Max Muster',
+        id: expect.any(Number),
+      },
     ])
   })
 
   it('should correctly import CSV Card for nuernberg', async () => {
     const projectConfig = nuernbergConfig
     const csv = `
-Name,Ablaufdatum,Geburtsdatum,Pass-ID
-Thea Test,03.04.2024,10.10.2000,12345678
-Tilo Traber,03.04.2025,12.01.1984,98765432
+Name,Ablaufdatum,Startdatum,Geburtsdatum,Pass-ID
+Thea Test,03.04.2024,01.01.2026,10.10.2000,12345678
+Tilo Traber,03.04.2025,01.01.2026,12.01.1984,98765432
 `
 
     await renderAndSubmitCardsInput(projectConfig, csv, setCards)
@@ -93,13 +128,23 @@ Tilo Traber,03.04.2025,12.01.1984,98765432
     expect(setCards).toHaveBeenCalledWith([
       {
         expirationDate: PlainDate.fromCustomFormat('03.04.2024'),
-        extensions: { birthday: PlainDate.fromCustomFormat('10.10.2000'), regionId: 0, nuernbergPassId: 12345678 },
+        extensions: {
+          birthday: PlainDate.fromCustomFormat('10.10.2000'),
+          regionId: 0,
+          nuernbergPassId: 12345678,
+          startDay: PlainDate.fromCustomFormat('01.01.2026'),
+        },
         fullName: 'Thea Test',
         id: expect.any(Number),
       },
       {
         expirationDate: PlainDate.fromCustomFormat('03.04.2025'),
-        extensions: { birthday: PlainDate.fromCustomFormat('12.01.1984'), regionId: 0, nuernbergPassId: 98765432 },
+        extensions: {
+          birthday: PlainDate.fromCustomFormat('12.01.1984'),
+          regionId: 0,
+          nuernbergPassId: 98765432,
+          startDay: PlainDate.fromCustomFormat('01.01.2026'),
+        },
         fullName: 'Tilo Traber',
         id: expect.any(Number),
       },
diff --git a/administration/src/bp-modules/self-service/CardSelfServiceForm.tsx b/administration/src/bp-modules/self-service/CardSelfServiceForm.tsx
index b8c596b7c..53be0a9ad 100644
--- a/administration/src/bp-modules/self-service/CardSelfServiceForm.tsx
+++ b/administration/src/bp-modules/self-service/CardSelfServiceForm.tsx
@@ -52,7 +52,7 @@ const CardSelfServiceForm = ({
   const [openDataPrivacy, setOpenDataPrivacy] = useState<boolean>(false)
   const [openReferenceInformation, setOpenReferenceInformation] = useState<boolean>(false)
   const [_, setSearchParams] = useSearchParams()
-  const cardValid = isValid(card, { expirationDateNullable: true })
+  const cardValid = isValid(card, projectConfig.card, { expirationDateNullable: true })
   const appToaster = useAppToaster()
   const showErrorMessage = touchedFullName || formSendAttempt
 
diff --git a/administration/src/cards/Card.test.ts b/administration/src/cards/Card.test.ts
index 7a5f55abf..96bc553d7 100644
--- a/administration/src/cards/Card.test.ts
+++ b/administration/src/cards/Card.test.ts
@@ -1,5 +1,8 @@
 import { BavariaCardType } from '../generated/card_pb'
 import { Region } from '../generated/graphql'
+import bayernConfig from '../project-configs/bayern/config'
+import koblenzConfig from '../project-configs/koblenz/config'
+import nuernbergConfig from '../project-configs/nuernberg/config'
 import PlainDate from '../util/PlainDate'
 import {
   MAX_NAME_LENGTH,
@@ -104,7 +107,7 @@ describe('Card', () => {
       expect(isValueValid(card, cardConfig, 'Name')).toBeTruthy()
       expect(isValueValid(card, cardConfig, 'Ablaufdatum')).toBeTruthy()
       expect(isValueValid(card, cardConfig, 'Kartentyp')).toBeTruthy()
-      expect(isValid(card)).toBeTruthy()
+      expect(isValid(card, cardConfig)).toBeTruthy()
 
       expect(getValueByCSVHeader(card, cardConfig, 'Name')).toBe('Thea Test')
       expect(getValueByCSVHeader(card, cardConfig, 'Ablaufdatum')).toBe(date.format())
@@ -136,7 +139,7 @@ describe('Card', () => {
       expect(isValueValid(card, cardConfig, 'Name')).toBeFalsy()
       expect(isValueValid(card, cardConfig, 'Ablaufdatum')).toBeFalsy()
       expect(isValueValid(card, cardConfig, 'Kartentyp')).toBeFalsy()
-      expect(isValid(card)).toBeFalsy()
+      expect(isValid(card, cardConfig)).toBeFalsy()
     })
   })
 
@@ -146,7 +149,7 @@ describe('Card', () => {
       const card = initializeCard(cardConfig, region, { fullName })
       expect(card.fullName).toBe(fullName)
       expect(isValueValid(card, cardConfig, 'Name')).toBeFalsy()
-      expect(isValid(card)).toBeFalsy()
+      expect(isValid(card, cardConfig)).toBeFalsy()
     }
   )
 
@@ -156,7 +159,7 @@ describe('Card', () => {
       const card = initializeCard(cardConfig, region, { fullName })
       expect(card.fullName).toBe(fullName)
       expect(isValueValid(card, cardConfig, 'Name')).toBeTruthy()
-      expect(isValid(card)).toBeTruthy()
+      expect(isValid(card, cardConfig)).toBeTruthy()
     }
   )
 
@@ -166,22 +169,68 @@ describe('Card', () => {
       const card = initializeCard(cardConfig, region, { fullName })
       expect(card.fullName).toBe(fullName)
       expect(isValueValid(card, cardConfig, 'Name')).toBeTruthy()
-      expect(isValid(card)).toBeTruthy()
+      expect(isValid(card, cardConfig)).toBeTruthy()
     }
   )
 
   it.each(['Karla', 'Peter'])('should correctly identify invalid fullname that is incomplete', fullName => {
     const card = initializeCard(cardConfig, region, { fullName })
     expect(isValueValid(card, cardConfig, 'Name')).toBeFalsy()
-    expect(isValid(card)).toBeFalsy()
+    expect(isValid(card, cardConfig)).toBeFalsy()
   })
 
   it(`should correctly identify invalid fullname that exceeds max length (${MAX_NAME_LENGTH} characters)`, () => {
     const card = initializeCard(cardConfig, region, { fullName: 'Karl LauterLauterLauterLauterLauterLauterLauterbach' })
     expect(isValueValid(card, cardConfig, 'Name')).toBeFalsy()
-    expect(isValid(card)).toBeFalsy()
+    expect(isValid(card, cardConfig)).toBeFalsy()
   })
 
+  it.each([
+    {
+      projectConfig: bayernConfig,
+      line: ['Thea Test', '03.03.2026'],
+      headers: ['Name', 'Ablaufdatum'],
+      missingExtension: 'Kartentyp',
+    },
+    {
+      projectConfig: nuernbergConfig,
+      line: ['Thea Test', '03.04.2024', '10.10.2000', '12345678'],
+      headers: ['Name', 'Ablaufdatum', 'Geburtsdatum', 'Pass-ID'],
+      missingExtension: 'Startdatum',
+    },
+    {
+      projectConfig: nuernbergConfig,
+      line: ['Thea Test', '03.04.2024', '10.10.2000', '10.12.2024'],
+      headers: ['Name', 'Ablaufdatum', 'Geburtsdatum', 'Startdatum'],
+      missingExtension: 'Pass-ID',
+    },
+    {
+      projectConfig: nuernbergConfig,
+      line: ['Thea Test', '03.04.2027', '12345678', '10.12.2024'],
+      headers: ['Name', 'Ablaufdatum', 'Pass-ID', 'Startdatum'],
+      missingExtension: 'Geburtsdatum',
+    },
+    {
+      projectConfig: koblenzConfig,
+      line: ['Thea Test', '03.03.2026', '12.12.2000'],
+      headers: ['Name', 'Ablaufdatum', 'Geburtsdatum'],
+      missingExtension: 'Referenznummer',
+    },
+    {
+      projectConfig: koblenzConfig,
+      line: ['Thea Test', '03.03.2026', '123K'],
+      headers: ['Name', 'Ablaufdatum', 'Referenznummer'],
+      missingExtension: 'Geburtsdatum',
+    },
+  ])(
+    `should invalidate card if '$missingExtension' is not provided for '$projectConfig.name'`,
+    ({ projectConfig, line, headers, missingExtension }) => {
+      const card = initializeCardFromCSV(projectConfig.card, line, headers, region)
+      expect(isValueValid(card, projectConfig.card, missingExtension)).toBeFalsy()
+      expect(isValid(card, cardConfig)).toBeFalsy()
+    }
+  )
+
   describe('self service', () => {
     const cardConfig = {
       defaultValidity: { years: 3 },
diff --git a/administration/src/cards/Card.ts b/administration/src/cards/Card.ts
index 2c1224728..e4f3dc0d3 100644
--- a/administration/src/cards/Card.ts
+++ b/administration/src/cards/Card.ts
@@ -131,10 +131,28 @@ export const isExpirationDateValid = (card: Card, { nullable } = { nullable: fal
   )
 }
 
-export const isValid = (card: Card, { expirationDateNullable } = { expirationDateNullable: false }): boolean =>
-  isFullNameValid(card) &&
-  getExtensions(card).every(({ extension, state }) => extension.isValid(state)) &&
-  (isExpirationDateValid(card, { nullable: expirationDateNullable }) || hasInfiniteLifetime(card))
+export const cardHasAllMandatoryExtensions = (card: Card, cardConfig: CardConfig): boolean => {
+  const mandatoryExtensions = cardConfig.extensions.filter(extension => extension.isMandatory)
+  return mandatoryExtensions.every(extension => Object.keys(card.extensions).includes(extension.name))
+}
+
+export const isValid = (
+  card: Card,
+  cardConfig: CardConfig,
+  { expirationDateNullable } = { expirationDateNullable: false }
+): boolean => {
+  console.log('fullname:', isFullNameValid(card))
+  console.log(
+    'expirationDate:',
+    isExpirationDateValid(card, { nullable: expirationDateNullable }) || hasInfiniteLifetime(card)
+  )
+  return (
+    isFullNameValid(card) &&
+    getExtensions(card).every(({ extension, state }) => extension.isValid(state)) &&
+    (isExpirationDateValid(card, { nullable: expirationDateNullable }) || hasInfiniteLifetime(card)) &&
+    cardHasAllMandatoryExtensions(card, cardConfig)
+  )
+}
 
 export const generateCardInfo = (card: Card): CardInfo => {
   const extensionsMessage: PartialMessage<CardExtensions> = getExtensions(card).reduce(
diff --git a/administration/src/cards/extensions/AddressFieldExtensions.ts b/administration/src/cards/extensions/AddressFieldExtensions.ts
index 47d746bcf..492fc05f2 100644
--- a/administration/src/cards/extensions/AddressFieldExtensions.ts
+++ b/administration/src/cards/extensions/AddressFieldExtensions.ts
@@ -26,6 +26,7 @@ const getAddressFieldExtension = <T extends AddressFieldExtension>(
   toString: (state): string => state[name],
   fromSerialized: (value: string) => ({ [name]: value } as AddressFieldExtensionState<T>),
   serialize: (state): string => state[name],
+  isMandatory: false,
 })
 
 export const AddressLine1Extension = getAddressFieldExtension(ADDRESS_LINE_1_EXTENSION)
diff --git a/administration/src/cards/extensions/BavariaCardTypeExtension.tsx b/administration/src/cards/extensions/BavariaCardTypeExtension.tsx
index 6628fa23c..8f74ec33f 100644
--- a/administration/src/cards/extensions/BavariaCardTypeExtension.tsx
+++ b/administration/src/cards/extensions/BavariaCardTypeExtension.tsx
@@ -75,6 +75,7 @@ const BavariaCardTypeExtension: Extension<BavariaCardTypeExtensionState> = {
   toString,
   fromSerialized: fromString,
   serialize: toString,
+  isMandatory: true,
 }
 
 export default BavariaCardTypeExtension
diff --git a/administration/src/cards/extensions/BirthdayExtension.tsx b/administration/src/cards/extensions/BirthdayExtension.tsx
index cf3bddbb6..1cc6b2aca 100644
--- a/administration/src/cards/extensions/BirthdayExtension.tsx
+++ b/administration/src/cards/extensions/BirthdayExtension.tsx
@@ -78,6 +78,7 @@ const BirthdayExtension: Extension<BirthdayExtensionState> = {
     return birthday === null ? null : { birthday }
   },
   serialize: ({ birthday }: BirthdayExtensionState) => birthday?.formatISO() ?? '',
+  isMandatory: true,
 }
 
 export default BirthdayExtension
diff --git a/administration/src/cards/extensions/EMailNotificationExtension.ts b/administration/src/cards/extensions/EMailNotificationExtension.ts
index ef0b03ac3..80581c3b4 100644
--- a/administration/src/cards/extensions/EMailNotificationExtension.ts
+++ b/administration/src/cards/extensions/EMailNotificationExtension.ts
@@ -17,6 +17,7 @@ const EMailNotificationExtension: Extension<EmailNotificationExtensionState> = {
   toString,
   fromSerialized: fromString,
   serialize: toString,
+  isMandatory: false,
 }
 
 export default EMailNotificationExtension
diff --git a/administration/src/cards/extensions/KoblenzReferenceNumberExtension.tsx b/administration/src/cards/extensions/KoblenzReferenceNumberExtension.tsx
index 567ccdb64..71b921896 100644
--- a/administration/src/cards/extensions/KoblenzReferenceNumberExtension.tsx
+++ b/administration/src/cards/extensions/KoblenzReferenceNumberExtension.tsx
@@ -87,6 +87,7 @@ const KoblenzReferenceNumberExtension: Extension<KoblenzReferenceNumberExtension
   toString,
   fromSerialized: fromString,
   serialize: toString,
+  isMandatory: true,
 }
 
 export default KoblenzReferenceNumberExtension
diff --git a/administration/src/cards/extensions/NuernbergPassIdExtension.tsx b/administration/src/cards/extensions/NuernbergPassIdExtension.tsx
index ac7ef5cab..857cd5dd6 100644
--- a/administration/src/cards/extensions/NuernbergPassIdExtension.tsx
+++ b/administration/src/cards/extensions/NuernbergPassIdExtension.tsx
@@ -58,6 +58,7 @@ const NuernbergPassIdExtension: Extension<NuernbergPassIdExtensionState> = {
   toString,
   fromSerialized: fromString,
   serialize: toString,
+  isMandatory: true,
 }
 
 export default NuernbergPassIdExtension
diff --git a/administration/src/cards/extensions/RegionExtension.ts b/administration/src/cards/extensions/RegionExtension.ts
index 1c8070914..13b02f784 100644
--- a/administration/src/cards/extensions/RegionExtension.ts
+++ b/administration/src/cards/extensions/RegionExtension.ts
@@ -21,6 +21,7 @@ const RegionExtension: Extension<RegionExtensionState> = {
   fromString,
   fromSerialized: fromString,
   serialize: toString,
+  isMandatory: true,
 }
 
 export default RegionExtension
diff --git a/administration/src/cards/extensions/StartDayExtension.tsx b/administration/src/cards/extensions/StartDayExtension.tsx
index cfc5a241f..23cd72ef8 100644
--- a/administration/src/cards/extensions/StartDayExtension.tsx
+++ b/administration/src/cards/extensions/StartDayExtension.tsx
@@ -6,7 +6,7 @@ import PlainDate from '../../util/PlainDate'
 import { Extension, ExtensionComponentProps } from './extensions'
 
 export const START_DAY_EXTENSION_NAME = 'startDay'
-export type StartDayExtensionState = { [START_DAY_EXTENSION_NAME]: PlainDate }
+export type StartDayExtensionState = { [START_DAY_EXTENSION_NAME]: PlainDate | null }
 
 // Some minimum start day after 1970 is necessary, as we use an uint32 in the protobuf.
 const minStartDay = new PlainDate(2020, 1, 1)
@@ -19,7 +19,7 @@ const StartDayForm = ({ value, setValue, isValid }: ExtensionComponentProps<Star
       required
       size='small'
       error={!isValid}
-      value={value.startDay.toString()}
+      value={value.startDay?.toString() ?? null}
       sx={{ '& input[value=""]:not(:focus)': { color: 'transparent' }, '& fieldset': { borderRadius: 0 } }}
       inputProps={{
         min: minStartDay.toString(),
@@ -35,7 +35,8 @@ const StartDayForm = ({ value, setValue, isValid }: ExtensionComponentProps<Star
   </FormGroup>
 )
 
-const isStartDayValid = ({ startDay }: StartDayExtensionState): boolean => startDay.isAfter(minStartDay)
+const isStartDayValid = ({ startDay }: StartDayExtensionState): boolean =>
+  startDay ? startDay.isAfter(minStartDay) : false
 
 const StartDayExtension: Extension<StartDayExtensionState> = {
   name: START_DAY_EXTENSION_NAME,
@@ -44,7 +45,7 @@ const StartDayExtension: Extension<StartDayExtensionState> = {
   causesInfiniteLifetime: () => false,
   getProtobufData: (state: StartDayExtensionState) => ({
     extensionStartDay: {
-      startDay: isStartDayValid(state) ? state.startDay.toDaysSinceEpoch() : minStartDay.toDaysSinceEpoch(),
+      startDay: isStartDayValid(state) ? state.startDay?.toDaysSinceEpoch() : minStartDay.toDaysSinceEpoch(),
     },
   }),
   isValid: isStartDayValid,
@@ -52,12 +53,13 @@ const StartDayExtension: Extension<StartDayExtensionState> = {
     const startDay = PlainDate.safeFromCustomFormat(value)
     return startDay === null ? null : { startDay }
   },
-  toString: ({ startDay }: StartDayExtensionState) => startDay.format(),
+  toString: ({ startDay }: StartDayExtensionState) => startDay?.format() ?? '',
   fromSerialized: (value: string) => {
     const startDay = PlainDate.safeFrom(value)
     return startDay === null ? null : { startDay }
   },
-  serialize: ({ startDay }: StartDayExtensionState) => startDay.formatISO(),
+  serialize: ({ startDay }: StartDayExtensionState) => startDay?.formatISO() ?? '',
+  isMandatory: true,
 }
 
 export default StartDayExtension
diff --git a/administration/src/cards/extensions/extensions.tsx b/administration/src/cards/extensions/extensions.tsx
index 2f85404c2..6bd244c09 100644
--- a/administration/src/cards/extensions/extensions.tsx
+++ b/administration/src/cards/extensions/extensions.tsx
@@ -41,6 +41,7 @@ export type Extension<T = Record<string, unknown>> = {
   toString(state: T): string
   fromSerialized(value: string): T | null
   serialize(state: T): string
+  isMandatory: boolean
 }
 
 const Extensions = [