Remove unused config flags

docs/sample_config.yaml

@@ -1290,17 +1290,6 @@ oembed:
 # Mandate that users are only allowed to associate certain formats of
 # 3PIDs with accounts on this server.
 #
-# Use an Identity Server to establish which 3PIDs are allowed to register?
-# Overrides allowed_local_3pids below.
-#
-#check_is_for_allowed_local_3pids: matrix.org
-#
-# If you are using an IS you can also check whether that IS registers
-# pending invites for the given 3PID (and then allow it to sign up on
-# the platform):
-#
-#allow_invited_3pids: false
-#
 #allowed_local_3pids:
 #  - medium: email
 #    pattern: '^[^@]+@matrix\.org$'

synapse/config/registration.py

@@ -35,10 +35,6 @@ def read_config(self, config, **kwargs):
 
         self.registrations_require_3pid = config.get("registrations_require_3pid", [])
         self.allowed_local_3pids = config.get("allowed_local_3pids", [])
-        self.check_is_for_allowed_local_3pids = config.get(
-            "check_is_for_allowed_local_3pids", None
-        )
-        self.allow_invited_3pids = config.get("allow_invited_3pids", False)
 
         self.disable_3pid_changes = config.get("disable_3pid_changes", False)
 
@@ -321,17 +317,6 @@ def generate_config_section(self, generate_secrets=False, **kwargs):
         # Mandate that users are only allowed to associate certain formats of
         # 3PIDs with accounts on this server.
         #
-        # Use an Identity Server to establish which 3PIDs are allowed to register?
-        # Overrides allowed_local_3pids below.
-        #
-        #check_is_for_allowed_local_3pids: matrix.org
-        #
-        # If you are using an IS you can also check whether that IS registers
-        # pending invites for the given 3PID (and then allow it to sign up on
-        # the platform):
-        #
-        #allow_invited_3pids: false
-        #
         #allowed_local_3pids:
         #  - medium: email
         #    pattern: '^[^@]+@matrix\\.org$'