organisation email

1.The organisation is refusing to mark me as a leaver due to claim of IG risk. 2. I was told the IG risk is due to the widening use and integration of the mail account across Microsoft products, including SharePoint and MS Teams. 3. I was told this IG issue means leaving staff would still have access to their previous organisation’s files, meeting and chats and there isn’t a solution to enable the current organisation to break the links, and team memberships etc. 4.I was told microsoft and The National mail team are working on a solution which will address this IG risk, but at the moment there is no solution therefore mail account cannot be transfered to another organisation. My Question is Please confirm the above is True or False