When I'm assigned as the peer reviewer for a pull request, I typically look over the code changes and then put in my comments. After that, I mark the pull request with "Request Changes" at the top, to signify that the assignee needs to look over the changes being requested, and tell them to fix the issues found.
The problem that I was told, is when the assignee has finished fixing the codes and updated them with the changes being requested, they said they have no idea how to notify the peer reviewer, that is making the requested changes, to revisit their pull requests.
The notification system isn't working as intended for pull requests.
How should I, the peer reviewer, receive notifications of the pull requests where the requested changes are implemented and fixed, from the assignee of the pull requests?