You must match the APK version to your OS version. Installing Account Manager 11 on Android 9 will likely result in a crash loop.
Factory Reset Protection (FRP) is a security feature introduced by Google (starting with Android 5.1 Lollipop) to deter theft. If a device is factory reset via the recovery menu without removing the primary Google account first, the device locks itself. Upon reboot, it demands the credentials of the last synced Google account. Google Account Manager 8 9 10 11 Apk Download LINK