When trying to delete a user who's the owner of a directory store, the admin is supposed to transfer ownership to another user before initiating deletion. New owners will need to reauthorize, in order to generate a new set of auth tokens. We'll update the ownership and authentication of directory stores on our side; the user may still need to reconfigure integrations on the store service side. There may be a temporary break in the sync, which will need to be addressed by the user.