Quick note: Windows 10 2004/20H2 and renamed Administrator accounts

This one popped up on Twitter today, although it’s been around for about a month:

https://support.microsoft.com/en-us/help/4592802/error-when-accessing-the-sign-in-options-or-users-mmc-snap-in

The quick summary from how I read this: If you’ve renamed the local Administrator or Guest accounts and then upgrade to Windows 10 2004 or 20H2, Windows will happily create new accounts for you with the right names and assign them the same SIDs and RIDs, which isn’t supposed to ever happen.

While a block was added to the Media Creation Tool and Windows Update, you could still run into this if you are deploying from media and not using dynamic update (to detect the block).

There’s no indication on timing for a fix.