diff --git a/fastapi_azure_auth/user.py b/fastapi_azure_auth/user.py
index 6dca7c9..ac13096 100644
--- a/fastapi_azure_auth/user.py
+++ b/fastapi_azure_auth/user.py
@@ -37,7 +37,7 @@ class Claims(BaseModel):
         ...,
         description='Specifies the expiration time before which the JWT can be accepted for processing.',
     )
-    aio: str = Field(
+    aio: Optional[str] = Field(
         ...,
         description='An internal claim used by Azure AD to record data for token reuse. Resources should not use this claim.',
     )
@@ -73,11 +73,11 @@ class Claims(BaseModel):
         ...,
         description='Represents the tenant that the user is signing in to',
     )
-    uti: str = Field(
+    uti: Optional[str] = Field(
         ...,
         description='Token identifier claim, equivalent to jti in the JWT specification. Unique, per-token identifier that is case-sensitive.',
     )
-    rh: str = Field(
+    rh: Optional[str] = Field(
         ...,
         description='An internal claim used by Azure to revalidate tokens. Resources should not use this claim.',
     )