my Gmail account reference
You appear to have no security keys registered on your account, and won’t be able to sign in. To sign in on this device, go to myaccount.google.com/security on another device where you’re already signed in. In your security settings, you can either: Register a new security key, or Choose another second step for verification
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Hi
This does not sound like an issue with Firefox for Android but is something that the Google support team should be able to help you with.