Tumbleweed: one user cannot log in

I have a user whose attempt to log-in bounces. The home is a folder on a data drive and is linked-to from under /home. I tried to test by copying the entire folder to the system partition under /home but that did't fix the issue. How can I find out what is causing the reject? This user cannot log-in, another one (another posting) can but cannot get on-line to do a zypper dup. I had presumed that the inability to log-in was related to the home being linked-to but that doesn't seem to be the case.