Ok... So apparently my tsysOS table contained an OS code "10.0.17134S", Which related to an old Server 2016 Core installation that has since been removed. Once I removed this from the database, it fixed the problem.
If you have a similar issue and want to remove a record with a bad OScode.. you can run this query in the database:
delete from tsysos where oscode = '10.0.17134S'
Your code will be different, but you get the idea. Thank you to the support team for that isolation. I had to run several reports for them to find that.
Thanks again!
Mike