Use your Google account (@atthegate.biz) to manage projects.
If you see Error 400: redirect_uri_mismatch
Add this exact URL to your OAuth client:
https://agatha-staging.atgdigital.co.za/accounts/google/login/callback/
Google Cloud Console → APIs & Services → Credentials → your OAuth 2.0 Client ID → Authorized redirect URIs → Add URI → paste the URL above (including trailing slash). Save.