subinacl should work.
https://social.technet.microsoft.com/Forums/en-US/9dd47a1b-ad0f-450c-9edc-d8dba0bd605d/ghost-unknown-accounts?forum=ITCG
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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Cannot delete account unknown S-1-5-21-
An Account deleted but the SID is in shared folder permission and users permission. This SID deleted but it returned itself.
Any one can help for how to delete this Account unknown or SID?
Thanks
subinacl should work.
https://social.technet.microsoft.com/Forums/en-US/9dd47a1b-ad0f-450c-9edc-d8dba0bd605d/ghost-unknown-accounts?forum=ITCG
--please don't forget to upvote
and Accept as answer
if the reply is helpful--