Mark Russovich wrote in 2009: duplicate SIDs do not matter for security: https://learn.microsoft.com/en-us/archive/blogs/markrussinovich/the-machine-sid-duplication-myth-and-why-sysprep-matters. Well, 16 years later, duplicate SIDs DO matter for security: https://support.microsoft.com/en-us/topic/kerberos-and-ntlm-authentication-failures-due-to-duplicate-sids-76f7394d-c460-4882-9ed1-d27e0960f949.
I recently started watching this guy’s streams on the Internet called Live Windows Training. It just so happened that a week before Microsoft posted this KB on the duplicate SID issue, this guy who has owned a computer repair shop for over 30 years figured it out. You can watch him articulate how he figured this out in this Youtube video: https://www.youtube.com/watch?v=jxBmUa_aKdo.
He used SIDCHG to fix the issue. Sure beats sysprepping or re-imaging all of the computers!
Googling “KB5065426 sid” brings up all kinds of posts on the issue.
-Soli Deo Gloria