Holding the Fn key by itself on Mac should bring up an emoji selection

My keyboard is dead/does not work, there are no inputs or lights in either wired or wireless mode. What should I do?

My keyboard does not work in cable mode. What should I do?

My keyboard is not working. I keep receiving an error message saying "USB device not recognized" by my Windows PC. What should I do?

Every time I turn my Mac Mini back on, It requires a password to start it up. My keyboard isn't working and connecting to it. What should I do?

When booting my Mac which has a Windows Bootcamp, my keyboard does not work and I can't get into the startup manager. What should I do?

Holding the Fn key by itself on Mac should bring up an emoji selection box. It doesn't work on the QMK keyboard.