# iOS TestFlight Google Sign-In Not Working - Certificate or OAuth Issue?

**URL:** https://community.thunkable.com/t/ios-testflight-google-sign-in-not-working-certificate-or-oauth-issue/4108678
**Category:** Questions about Thunkable AI
**Created:** [May 27, 2026, 8:43am UTC](https://community.thunkable.com/t/ios-testflight-google-sign-in-not-working-certificate-or-oauth-issue/4108678 "2026-05-27T08:43:12Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![cicraf](https://avatars.discourse-cdn.com/v4/letter/c/cdc98d/32.png) [@cicraf](https://community.thunkable.com/u/cicraf)
#### Post date: [May 27, 2026, 8:43am UTC](https://community.thunkable.com/t/ios-testflight-google-sign-in-not-working-certificate-or-oauth-issue/4108678/1 "2026-05-27T08:43:12Z")

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Hi everyone,

I’m experiencing an issue with Google Sign-In on iOS TestFlight. The signin works perfectly on Android (both APK and AAB), but fails on iOS TestFlight.

In Google Cloud Console, I see “Unknown command” errors when attempting to sign in, which suggests communication is happening but being blocked.

Has anyone else encountered this? Is it a known TestFlight limitation with OAuth, or a keystore/certificate mismatch?

I’m using Automated Provisioning with Firebase Authentication configured correctly (SHA-1 fingerprint, Client IDs, etc.).

Thanks for any insights!

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### Author: ![system](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/0/f/0f59f292712368bce16ff80133ae10de8a6f27e8.png) [@system](https://community.thunkable.com/u/system)
#### Post date: [August 25, 2026, 8:43am UTC](https://community.thunkable.com/t/ios-testflight-google-sign-in-not-working-certificate-or-oauth-issue/4108678/2 "2026-08-25T08:43:43Z")

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