All users other than one have been synced. This has to be related to the user account. FYI this was all set up to sync existing 365 users to on prem ad. So we had to add the UPNs, set the mail and SMTP. That was all completed before attempting to sync this account.
I am now having a sync issue with another user and not hard match or soft match will resolve the issue.
We are getting a sync error message from 365 in regards to an .onmicrosoft account that DOES NOT exist. Previously when dealing with sync issues Azure AD connect would create that account because SMTP proxy was missing or incorrect UPN. For this user that was not the case, everything was set correctly to perform a soft match. If I pull the immutable ID for the cloud user it is correct.
So far I have manually set the immutable ID for the correct cloud user that is...