'Google Sign In within embedded browsers (Messenger, Instagram) not working.. Googles webview policy?

I have a Nextjs web app with Firebase Auth. I only allow my users to login with Google.

All my traffic is coming from social media apps which have an embedded browser. So on launch day I learned that signing in only works directly from a browser like chrome or safari but not within a webview within an application. This is a nightmare.

I tried switching from signInWithPopUp() to signInWithRedirect(), but still same issue.

error 403: disallowed_useragent

This app doesn't comply with Googles webview policy.

enter image description here

Has anyone encountered this problem?

reactjsfirebaseauthenticationoauth


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