PI Vision admins manage identities stored in back-end to clean up old removed identities and their display sharing settings
PI Vision admins should be able to manage Identities to review and delete stale Identity entries from the SQL back-end, along with any display sharing for them. Since PI Vision administrators have no way of managing the Identities on their Vision server, they cannot clean up identities that were deleted or were from an old AF Server.

This issue is being tracked as a bug reported through Tech Support:
https://customers.osisoft.com/s/knowledgearticle?knowledgeArticleUrl=2471263140651960241-217230
We will delete this enhancement request shortly and track other customers running into this bug through TechSupport.
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VMichiel commented
We have more than 5000 displays with different security groups on them. In the display utility tool, i still have to go through all the rows to delete the deleted identities. This is not a viable option for us. Please proceed with solving this bug.