does /play/computer?fen link work with all computer types? Students report it doesn't work

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 

It opened up to a KR vs. K position for me.

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