I guess it’s supposed to be right Option. Since I’m not on a mac I can’t test it there. Have you looked at the configuration menu to see if there is a setting? On Windows there’s a dialog that has some settings. It might have something you could change:
Otherwise, someone else will have to help!
I did try the keyboard out on my machine and the key outputs correctly on Windows so I don’t think it’s an issue with the keyboard itself, I think it’s a setting.
Actually discovered the issue and resolved after some digging.
For some reason, when you install the latest version of Keyman on macos it will require to allow permission to keyboard and other settings that you need to allow. You then need to re-install keyman in order to work properly since permission we’re accepter afterwards.
Glad you found the cause of the problem! Generally, the security settings seem to propagate automatically most of the time, and we haven’t identified precise scenarios in which they are lost. For future readers, this may also be helpful: https://help.keyman.com/knowledge-base/?id=104