registration password is wrong based on the server logs
Please specify the log which provided the error, and the actual error itself. I hate assumptions.
Check:
1) Admin=> Phones : Extension/Registration password in Vicidial admin UI (Note that even the best of us sometimes "decide" that we are on the correct extension and realize after a few minutes we were ... not, lol)
2) /etc/asterisk/sip-vicidial.conf under that same [XXXXX] extension entry that the "secret" matches the registration password you set (in case there was a problem with writing the new conf file)
3) "asterisk -R" ... "sip reload" and verify no errors
4) "asterisk -R" ... "sip show peers" and verify the extension in question appears as a "peer"
5) consider killing asterisk and restarting it (or let it auto-restart). Sometimes unusual circumstances can "lock" the password if you have previously created a sip account and then changed the password after creation.