As Kasun Bandara mentions, you'll need to go through the password reset process if the SSH/CLI credentials do not work.
As an addition to that, I want to mention one thing that is important and sometimes people forget:
During the install, you are asked to create administrative credentials (user/pass).
Those credentials are then used to create two separate users with the same username, one for CLI and one for GUI.
It's the same username but not the "same" user.
The GUI admin users, by default, has password expiration, where as the CLI does not.
(GUI admin password policy can be modified at System->Admin Access->Authentication->Password Policy)
If an admin logs into the GUI and is prompted that the password is expiring and changes the password, the CLI password for the "same" user does not change.
So if you happen to have a password manager that has the history of previous passwords, you may be able to find the original password that could work for CLI/SSH.
For this same reason, it's important that when documenting the password, to maybe have 2 separate entries, one for CLI and one for GUI, since someone might change one but not the other.
