Finding used Keyboard Shortcuts
How does one find the complete list of the keyboard shortcuts that are in use?
I use Superhuman for email. It's key selling feature is speed, particularly keyboard shortcuts. Switching email accounts is typically done using control+1, control+2, etc.
However, on my personal MacBook Air, control+2 does not work. Superhuman support and I have determined that there is another application using that keyboard shortcut, but I certainly can't find it.
I have combed through System Preferences > Keyboard > Shortcuts and found nothing.
Does anyone know of another way to discover these? Are the controls written to a file somewhere?
Thanks in advance.