When I wake my Mac from sleep and enter my username and password, it does not indicate that the credentials are wrong, but it will not log in.
The security update 2021-04 for Mojave released in May 2021 by Apple includes a bug that incorrectly prevents devices from unlocking with Active Directory accounts.
Updating the OS to a new version (Catalina (10.15) or Big Sur (11)), if possible, will resolve the issue.