How do I remove a Page Owner?

This one admin on our Facebook Page added the page to his Business Manager behind our back and vanished. We cannot contact him anywhere. I don’t know why he did it but it’s been months now and he hasn’t posted on the page and hasn’t responded to any messages. We really want to change this but as far as I know, we cannot change it.

Do you think contacting FB in any way could resolve this? Or is there any trick where you can change Page Owner or something?

There is no trick, and you can’t contact FB to resolve this. We’ve tried so many times in the past, never worked.