Class -> teacher feature not working

As a teacher I'd like to add another teacher to our lichess class. However, when I write his name in "Edit" bookmark, nothing happens in his profile. Even though me and my students see him as a teacher, the class doesn't appear to him at all.

Thank you for your suggestions.

Dear Jelen,

this happens because you are not an IM.

Best regards
Vojta

OK, thanks for your tip. I'll try to fix that issue.