User info endpoint is unreachable

When the user is not allowed by the identity provider to access the userinfo endpoint, openid connect will throw an exception. Basically all required user information can be provided with the openid claims, and if the additional user information is not accessible via userinfo_endpoint, try to get all of the mandatory user information from the openid claims. If the requested user information is not found in the openid claims, then an warning/exception is logged.