Hello,
I have same problem as described in https://forum.avast.com/index.php?topic=230704.0, but restarting the device doesn’t work. I have Mi 9.
I also have this problem on Huawei P30. PIN is set up, permissions have been granted, but when trying to login I get a “login failed” message. I have already restarted the device and that didn’t solve the issue.