UXP Shortcuts not working

While developing a UXP Plugin I required to add some keyboard shortcuts. I used the correct setup described in the manifest recommendations (this is the Adobe exmaple, not my usage):

"shortcut": {
"mac": "Cmd+Shift+P",
"win": "Ctrl+Shift+P"
}

However, when called they don't work. Any clues to what I am doing wrong?