It opened up to a KR vs. K position for me.
does /play/computer?fen link work with all computer types? Students report it doesn't work

yea that is the right position. Anyone have a mac? Or I wonder if not having a chess.com account makes it fail? Anyone else have trouble with /play/computer URL's?

When I copy & paste your above link, there is an extra hidden %C2%A0 at the end of the link. Although it still works for me, maybe it's causing a problem for some of your users? Maybe try deleting those extra hidden characters and have them try again.
This would be the corrected link, without the extra hidden characters:
https://www.chess.com/play/computer?fen=8%2F8%2F8%2F3k4%2F8%2F8%2F8%2F3KR3%20w%20-%20-%200%201
I gave this link out to my 15 chess club students, and many of them reported back that it opened to a new game and didn't work. What am I doing wrong?
https://www.chess.com/play/computer?fen=8%2F8%2F8%2F3k4%2F8%2F8%2F8%2F3KR3%20w%20-%20-%200%201