So he is using a Razer Ornata keyboard, and enabling 'gaming mode' fixed 1-9, but the letter keys weren't working
I had him close Razer everything and now every button works... He launched Razer Synapse (the main and everything still works. He launched Razer Cortex and it broke again. LOL

Razer Cortex was the issue here, and as an entirely optional addon, Cortex was quickly uninstalled. XD