remove a required reviewer from Azure Devops

We have a gentleman who is no longer actively working on a project. The problem is he is a required reviewer on our Pull Requests.

I have not been able to find a way to remove him, and we cannot complete our pull requests.

I have spent several hours looking at every option that I can find.

Update 10/10 -- We attempted to use the API and remove this reviewer and do another PR, but with no luck yet. We have even tried having other reviewers approve, but without the other required one it just will not let us complete. I would be happy to move this question as I know it is not code related, but don't know where to....this is not just a 'what tool do you think is best' question --- we are really in a bind here!

Check the branch policy of the parent folder, I was having a similar issue but got resolve when disabling the policy for both the folders.