How do I add a required reviewer when people of a given team create a pull request in DevOps?

After hours of googling and search, I can't find how to add a required reviewer when people of a given team create a pull request in DevOps.

Some people will be able to contribute to our repository, but they are external to our company, that's why we want to enforce this control.

Does anyone ever did it?

Thanks.

It seems that you want to conditionally set the required reviewers according to which team the pull request creator comes from. If so, I think there is no such built-in function currently provided.

Currently only the filter condition of "based on which files changed" is provided.

You could add this feature request on our UserVoice site , which is our main forum for product suggestions. After suggest raised, you can vote and add your comments for this feedback. The product team would provide the updates if they view it.