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Only @evinced.com accounts can access this app.
Before signing in: add this origin in Google Console
Credentials → your OAuth 2.0 Client ID (Web) → Authorized JavaScript origins → Add URI:
Use the exact URL from the address bar (e.g. http://localhost:3000). Save in Console and wait a minute, then try again.
Seeing "Error 400: origin_mismatch"? The origin shown above must be in Authorized JavaScript origins for your Web application OAuth client (not Android/iOS). Add it, save, wait ~1 minute, then retry.