SMB problems after update to 12.0-release on ONE computer

I have two fairly identical servers. 32GB dual Xeon CPU X5355.
I updated both to TrueNAS-12.0-Release.
Now the primary system will allow SMB logons from Windows 10 devices, but the SECONDARY server refuses logons.
No changes were made to any login or passwords on either system

Since this is a method to compare what could have gone wrong with the second system, and what differences could have been created during an update, I am notifying support.
Is there anything obvious that could have caused this? My primary system works find, secondary is no longer accessible via SMB.
LOGON to web UI using same credentials works fine, Both systems WERE working normally, now only one is.