diff --git a/fastapi_keycloak/model.py b/fastapi_keycloak/model.py
index 0bc1a07..67289a4 100644
--- a/fastapi_keycloak/model.py
+++ b/fastapi_keycloak/model.py
@@ -97,6 +97,7 @@ class OIDCUser(BaseModel):
     details. This is a mere proxy object.
     """
 
+    azp: Optional[str]
     sub: str
     iat: int
     exp: int
@@ -118,18 +119,26 @@ def roles(self) -> List[str]:
         Returns:
             List[str]: If the realm access dict contains roles
         """
-        if not self.realm_access:
+        if not self.realm_access and not self.resource_access:
             raise KeycloakError(
                 status_code=404,
-                reason="The 'realm_access' section of the provided access token is missing",
+                reason="The 'realm_access' and 'resource_access' sections of the provided access token are missing.",
             )
-        try:
-            return self.realm_access["roles"]
-        except KeyError as e:
+        roles = []
+        if self.realm_access:
+            if "roles" in self.realm_access:
+                roles += self.realm_access["roles"]
+        if self.azp and self.resource_access:
+            if self.azp in self.resource_access:
+                if "roles" in self.resource_access[self.azp]:
+                    roles += self.resource_access[self.azp]["roles"]
+        if not roles:
             raise KeycloakError(
                 status_code=404,
-                reason="The 'realm_access' section of the provided access token did not contain any 'roles'",
-            ) from e
+                reason="The 'realm_access' and 'resource_access' sections of the provided access token did not "
+                       "contain any 'roles'",
+            )
+        return roles
 
     def __str__(self) -> str:
         """String representation of an OIDCUser"""