“Knowing is not enough; we must apply. Being willing is not enough; we must do.”
Google authentication doesn't work properly in Facebook or Instagram's built-in browser. Please open this page in your phone's default browser (Safari, Chrome, etc.) to sign in with Google.
Look for a menu button (usually three dots) and select "Open in Browser" or similar option.
In-app browsers have security restrictions that prevent Google's OAuth authentication from working properly. Your default browser provides the secure environment needed for Google sign-in.