Hi,
Bit of a strange one wondering if anyone else has had the same problem...
We removed a user a few years ago when he left the organisation, he was admin on ArcGIS online, however recently we have been getting undeliverable mail notifications for him sporadically over the past 6 months or so, possibly as that's IT just deactivated his email account!
He has been removed as a user and I cant find any listing of him in ArcGIS online or in myESRI, anywhere else I can look as I want to ensure that when we remove a user they still don't have access to our locked content.
Thanks
Sarah