RegisterLogin

What does “Access blocked: This app’s request is invalid (Error 400: redirect_uri_mismatch)” mean?

What does “Access blocked: This app’s request is invalid (Error 400: redirect_uri_mismatch)” mean?

This message appears when Google rejects the sign-in request because a technical callback address (the redirect URI) doesn’t exactly match what’s registered for our app. It’s a configuration issue on our side, not a problem with your account.

Did I do something wrong?

No. You didn’t do anything wrong. The app configuration needs to be updated.

What can I do right now?

  • Use an alternative sign-in method (Email/OTP/Passwordless) if available.

  • Try again later. We update the configuration promptly once identified.

  • If you still prefer Google sign-in, try these quick checks:

    • Ensure that Google Play services (for Android) and your default browser (Chrome/Safari) are up to date.

    • If you previously tried and got stuck, clear the Agent app data and retry: Android: Settings → Apps → [Agent app] → Storage → Clear data. iOS: Reinstall the app.

Is my data safe?

Yes. The login did not complete, so no new data was shared with the Agent app. Your Google account remains secure.

I’m a tester and still see the error—why?

If the app is in a testing phase, only emails added as Test Users can sign in with Google. Please get in touch with support with the email address you’re testing so we can verify your access.

I use a work/school account (Google Workspace). Can I sign in?

Some organizations block third-party sign-in by policy. Please try a personal Gmail account or ask your IT admin to allow sign-in to MyPhones.

The button doesn’t open Google or seems unresponsive on Android.

  • Update Google Play services and your browser.

  • Ensure you have a system browser enabled (e.g., Chrome).

  • Precise the agent app data and try again.

When will this be fixed?

We treat this as a priority configuration issue. Once updated, Google sign-in will work normally. You can use Email/OTP sign-in in the meantime.

How will I know it’s resolved?

We’ll update the in-app notice and our status/updates page. You can also retry Google sign-in after a few minutes.

I used Google sign-in before—why does it fail now?

Your previous session may have expired due to a change in our configuration. Please use Email/OTP to log in once, and you can try Google sign-in again later.

Still need help?

Contact Support with:

  • Screenshot of the error page

  • Your app version and platform (Android/iOS/Web)

  • The Google account type (personal or Workspace)