My personal account was tied to that tenant, and whenever I tried to register an app - it was access denied. They even give you an option in the app registration interface in Azure: whether you want it to be in the company tenant or linked to your personal account. Regardless of what I tried, access denied. After a few weeks of this, I attempted to “Leave” the proof of concept tenant.
Yes, I clicked the scary leave button that tells you your data will be deleted. Access denied.
One of the options Microsoft suggests is to get in contact with the global admins to help out. Considering that tenant was abandoned 8 years ago, it was going to be difficult to get in contact with the global admins. I even contacted my former employer and requested they remove me. Their response? “We abandoned that tenant years ago, no one can access it”.
I created a support case with Microsoft for their Azure AD service requesting they remove my account from the tenant.
After some back and forth, repeating myself a few times, trying to explain what I save wanted to do in multiple different ways, and a screen share, I still wasn’t able to leave the organization. The case was escalated, and eventually I got on a call with the support rep and a manager.
We went through the “leave the organization” process together, and miraculously, it allowed me to leave. This was several months ago, by the way, and no data loss with my personal account that I can tell (so far), although I can’t guarantee when you click that scary button, your data will be safe.
I’m not sure what technical witchcraft took place for this to happen, because it was the exact same set of steps I had tried 25 times before. My only point in this story is to say it would probably be worth a shot creating a support case with their Azure team, and being a squeaky wheel, in the behemoth cog that is Microsoft, that gets the grease.