Google SignIn in Android and IOS with backend server - google-api

I am developing an app in Android and IOS. I want to use the Google Sign In to login in the app.
In Android I use the client ID of the backend server, but in IOS I have to use the IOS app client ID to login.
Is not possible to use the backend server client ID in the IOS app?
Google Documentation
https://developers.google.com/identity/sign-in/ios/backend-auth
Regards

I work on the team at Google: yes, unfortunately, this is a known deficiency and inconsistency of the iOS SDK for Google Sign-In. We're working on some changes and I'll update this answer when this is resolved.
For now, your backend server will have to determine what client the token is coming from and check appropriate audience. Very sorry for the trouble :/

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