Player 2 A and B buttons do not work in Mupen64plus

I sucessfully connected my BT-enabled Jelly Comb keyboard to my GameShell via the launcher, connected it to my TV with an HDMI cable and attempted to map Player 2 controls onto my keyboard so 2 players can play on the same keyboard. After a while I was able to map the WASD keys as the Player 2 analog stick, and it sucessfully worked! :smiley: However, when I mapped the n64’s A to keyboard C and B to V, they didn’t work. I tried a bunch of other keys, checking if other functions used the same key, and still wasn’t able to get the Player 2 A/B buttons to work. The Player 1 controls all work as intended, but something is wrong with the Player 2 mapped keys…
I’m using @javelinface’s custom DEOT os: Custom D.E.O.T. V2.0+/Clockwork OS v0.5 image - With customised DEOT interface, Kernel 5.7, Optional 1400MHz OC, Debian 10 Buster, Retroarch 1.8.9, Mupen64+ plus more! (Current build: 200626)