Error validating user
Access tokens are items used by applications which are used to make API requests on behalf of the user.
Perhaps your refresh token was still good from an earlier authentication. We are working to fix this, but until then, please use a service principal.You can check the official documentation on How-To: Handle expired access tokens by Facebook itself.Note: In some cases in the development environment, users have the Remove offline_access permission enabled.We are enabling login for MFA enabled environments very soon.Currently, you can create a service principal though Azure Power Shell or the Azure Portal. To create a service principal via the portal, see: https://azure.microsoft.com/en-us/documentation/articles/resource-group-create-service-principal-portal/.