We had this happen over the summer to someone that left and were removed from the team. It was resolved by contacting Dropbox support, so I'm not sure why you've not had luck with that but then it is the holiday period. Dropbox's recent changes to how Teams Admins can manage connected accounts (which in my opinion are a bit excessive) might help with this process. Their ToS explains these changes but an email they sent round in October explains it better: https://www.evernote.com/shard/s5/sh/39bd6ae2-a0b6-41a9-87a4...