This is a bug that has been going on for several months now. The real ID request still shows after blocking it. When trying to accept/deny again it just says something went wrong.
I was able to somehow remove a person from there around a month ago, I believe it was through the desktop app but I don’t want to debug it any more.
This has been the case for all blocked (2) real ID requests so far. It is device-independent, bug is there in desktop and mobile app as well.