Hello Wayne,
Thank you for coming to the forum, my name is Fuad.
The F4 key still works fine, and I am using Office 365. Are you sure the problem is not the keyboard, check if your F4 is a second function key.
Press Fn + F4
If that works, that means on your keyboard F4 is a second function key, that issue has nothing to do with Excel itself.
I kindly await a reply for a follow-up
Best Regards Fuad
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