If a user previously set in the Relay AllowList is deleted, the deleted user will remain in the list and the error "The specified login is inactive or invalid" happened when I try to save the list.
Even if I click "Save" without editing anything, same error occurs.

It is not possible to export the user s of Relay AllowList, and there is no choice but to check each account one by one and deal with it, so I request improvement.