"Command-Tab" not working in Full Screen Mode

Issue:

When I'm using a visualization app "G-Force" and it's in Full-Screen mode on a 2nd display (extended monitor or projector), I am unable to use the "Command-Tab" function to jump between programs.

I have tested the 2nd display / monitor with other Full-Screen apps like Google Photos in Slideshow mode, and I have full use of my "Command-Tab" function... Why not G-Force?

Another oddity, with G-Force in Full-Screen on 2nd monitor, while working on the Main display, I DO have use of "Command-Tilda", which jumps between pages on Chrome etc. Why this function, but not the Global Macro of "Command-Tab"?

I already have the Mission Control: "When switching to an application, switch to a space with open windows" checked, and it has been checked throughout this issue. I've also tried restarting etc.

Thanks!

Brandon

Mac OSX Monterey

MacBook Pro (16-inch, 2021) M1