Unable to Remove Google Account on Android Phone
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Solutions found on Baidu and Google, both domestic and international, all suggest that removing lock screen methods such as fingerprints or passwords before deleting the account should work.
Many people have succeeded, but there are also many who have not. For many, the ultimate solution is to reset the phone.
On my newly purchased Xiaomi Mi 8, this method did not work either. After some exploration, I discovered that deleting all dual apps, restarting, and then removing the various lock screen methods allows you to delete the Google account.
The same method works for some but not others; the reason lies in the different application environments. As for the deeper reasons, since I am not an Android expert, I will leave that to the professionals to explain.