The redirect URI in the request, https://projekte.hannovermachen.de/login/google, does not match the ones authorized for the OAuth client. To update the authorized redirect URIs, visit: https://console.developers.google.com/apis/credentials/oauthclient/628018915681-1v3oqdo1g12774d8qq3aemo1oclntlm8.apps.googleusercontent.com?project=628018915681