Google Docs "add a comment" shortcut (⌘+⌥+M) not working

Question

I cannot add a comment using Google Docs' defined shortcut on my MacBook Pro (Sierra 10.12.4, but I've been having this issue since Mavericks).

(Side note: The keystroke for entering a footnote works perfectly fine).

I've gone through my keyboard shortcut settings and assigned away all shortcuts that use the "M" key, here:

(I've checked "Accessibility" and the other categories to ensure no use of the "M" key in any shortcuts -- active or inactive.)

Am I potentially misunderstanding in that the "option" key as defined by Google is something other than the Mac ⌥ key?

Answer 1

I had the same problem, then discovered the depressing the keys in sequence worked:

1. option
2. command
3. m