BIOS no keystroke recognition during POST... try this!

Weird issue with no keyboard recognition during POST, but DOES recognize keyboard input when THREE keyboards are conneced???

I previously ran into a similar issue with a Z790 motherboard where no keystrokes were recognized during POST, but two keyboards suddenly worked for some reason, so I decided to try two for this issue. No change. Moreso being silly and not actually expecting a change I decided to try three keyboards and it worked!

If anyone has an explanation I would love to hear your input! ... https://www.youtube.com/watch?v=PVboSDF5uUc