Congrats ... your persistence has paid off!
There is a cli script to sync users in Moodle with LDAP/AD. To be honest, I'd shy away from that ... unless one is sure the setup in moodle is right on target for OU's etc. of LDAP/AD ... if not, a bunch of junk accounts get created.
It's an all or none script ... can't be selective and point to just one user.
For that one user, you'll have to be persistent again ... check the account in LDAP/AD as seen in whatever you have to browse the OU's/Forest or whatever you have setup.
Then double check what you've set up in moodle for mappings and what they expect to get from LDAP/AD.
Now you won't see the password in moodle ... but you should be able to see all the other required fields ...
A mysql query from the moodle server on mdl_user table that restricts to only that user might provide clues as to what Moodle knows about that one user.