Not able to check the password

Dear Team,

I have one Linux system , i am facing issue to check the password.

Below troubleshooting steps are performed:-

1 - Telnet is successful.

2 - System test is successful.

3 - When i check the password of functional account getting the error :-  Unable to connect to <system name>, or the account <Account name> does not exist or is disabled.

4 - My question is if the system test is successful (Because the testing of the system is performed via functional account ) Why i am getting this error.

Need your help to resolve this issue.