Hi there - hope you're well!
I think there's some confusion about what exactly you're trying to accomplish.
You've stated in the title of the thread that you want to remove Ezoic from the AdSense account, is that correct?
If so, you can just remove the Ezoic entry from the managed third-parties tab.
If you're referencing AdManager MCM program though, that's a bit of a different situation.
If you're able to clarify the following we might be able to help better:
a. Why are you looking to remove Ezoic?
b. Where are you attempting to 'remove' Ezoic from?
c. Can you provide both the question you asked of Google support and their response, in full?