Outlook CTRL + Shift + # Quick Step keyboard shortcuts stopped working

I use my Quick Step shortcuts frequently with Outlook to manage my mail. They worked fine for a while, and the steps still do, but the keyboard shortcuts no longer do anything.

I've looked online for a solution, but I haven't seen any related to this specifically, and none of the generic fixes I found helped. Any ideas?

Windows 10 - 64 bit Outlook 2010

Update: Well after about 2 weeks of not working, it started working again with no interaction on my part. I'll leave this up here, because if it happens again, and someone knows a way to fix it that doesn't involve magic, it'll be useful to know.

I had this problem, and it turned out that the same shortcuts were used by Opera. Closing Opera resolved the issue in my case.

I had this same issue and it turned out to be an extension in Edge that was using the same shortcuts. I removed the shortcuts from the extension and the problem was solved.