They're Capability SIDs. Please see the following article for more information.
Some SIDs do not resolve into friendly names | Microsoft Learn
Unknown account
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Anonymous
When I look at group or usernames under windows properties, I see an "Account unknown". This account starts with S-1-15 and has a bunch of numbers separated by hyphens in groups of 7 to 8 characters.
What is this and is it supposed to be there?
Windows for home | Windows 11 | Accounts, profiles, and login
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Anonymous
2023-06-15T19:35:11+00:00 Never heard that before. Thanks!