Apenas para informar aos administradores deste fórum que parece haver algum problem no login com credenciais externas.
O Google dá o seguinte erro:
Error 400: redirect_uri_mismatch
You can’t sign in to this app because it doesn’t comply with Google’s OAuth 2.0 policy.
If you’re the app developer, register the redirect URI in the Google Cloud Console.
The content in this section has been provided by the app developer. This content has not been reviewed or verified by Google.
If you’re the app developer, make sure that these request details comply with Google policies.
redirect_uri: Fórum do Instituto Brasileiro de Informação em Ciência e Tecnologia
E no Facebook:
App Not Setup: This app is still in development mode, and you don’t have access to it. Switch to a registered test user or ask an app admin for permissions.