I can confirm that the shift + right click method does not work for the NordVPN. Simply, nothing happens. It does work for Firefox, but not for the window I actually need to move. Super frustrating.
What did work for me was alt + space. Then click move, and use the arrow keys to move the window where you need it, and left click. Hope this helps.
Thank you so much! This should be the main answer to this question! Had a problem with NordPass, I'm not sure how are their apps different to not trigger some of the suggestions above, but since this one always works, I really can't recommend it enough.