This morning I received a note that a shared user was removed by that same shared user.
Clayton Harris was terminated a few weeks ago, but it says he removed himself from this specific sheet. Very alarming! His SSO account was deactivated. It looks like he still had access!
In the Activity Log, you can see our head of security Shawn Jones removed Clayton from our main group, which removed him from sharing. But the alert didn't mention Shawn Jones.
Not sure if anyone has run into this like me, but it would be good for Smartsheet to bug fix this in the future.