"Switch to Desktop 1" not working
I'm running OS 10.13.4 on a Mac Pro (Mid 2012). I have multiple Spaces set up in Mission Control (with the intent that I have 3 Spaces, but I've got 4 Spaces right now for workaround reasons that I'll explain in a moment).
This is my current Keyboard panel, Keyboard tab:
...and this is my Keyboard panel, Shortcuts tab:
The keyboard shortcuts for "Switch to Desktop 2", "Switch to Desktop 3", and "Switch to Desktop 4" all work as expected. But, no matter what shortcut I assign to "Switch to Desktop 1", pressing the shortcut does not work. I've even tried swapping F16 and F19 in the assignments, above, and "Switch to Desktop 1" still does not work. It just gives me an error beep when I tap that shortcut.
I want 3 Spaces that I can switch between with a specific keyboard press for each space. The workaround I'm using is that I have 4 Spaces instead, since the first Space cannot ever have a working keyboard shortcut, and I switch between Spaces 2, 3, and 4.
Does anyone know how to fix this so that "Switch to Desktop 1" works? Thanks in advance!
Mac Pro, macOS High Sierra (10.13.4)