cognito: "Validation Error for Claims" - when using custom attributes in cognito

[JustinGuese]

Hey,
I just can't get cognito to work with this library...
I am using the second example

def secure_access(current_user: AccessUser = Depends(auth.claim(AccessUser))):
    # access token is valid and getting user info from access token
    return f"Hello", {current_user.sub}

with the example

class AccessUser(BaseModel):
    sub: str

But as soon as I add custom attributes that are set in my cognito pool, like "email" or "family_name", it throws the error
"Validation Error for Claims"

How can I add custom attributes to grab them like current_user.family_name ?

[onejgordon]

Also interested in whether additional custom Cognito attributes are supported.