Can you share the sanitized config of the ASA?
It may be that ASA cannot communicate to your TACACS server.
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Firewall with issue, is configured as a standby unit dude some issue primary firewall goes down and standby unit become active.
After the failover, secondry firewall (which was act as standby unit) become active. We also configured local authentication on ASA in case TACACS server goes down so we login by local user and password.
But in our case TACACS server is working fine.
We are unable to login tacacs or by local user
Getting the same issue on other ASA . Still unable to figure out what's going. I have remove the device from TACACS SERVER so I can login by local user and password but no success.
Even try to login by console