In the user management searching for users searches search for "-" account status. This implies "any status". However, this is not the case. The code searches only in "active" status (active and not deletable). Users from "Login denied" are considered being not active, thus they are not found.
This can be fixed by adjusting the labeling.
The second issue is that is is not possible to search for deleted user accounts. When using this new option, the username and email address should be wildcarded so that the backup prefix is ignored.
E.g. "bla" user name should be converted to "*bla" to match "1234_bkp_bla" in the database