So if I'm messaging friends or typing something in google, every time I hit the 'T' key my speakers play the 'push to mute' sound. However, anytime I'm not playing Rainbow Six, or any other video game, but have discord running.

I play Rainbow Six: Siege competitively and have in-game push to talk button set to 'T.' I also have a keybind that will 'push to mute' me every time I hit 'T,' that way my callouts aren't echoed in the discord voice channel, since they can hear me just fine in-game.

I've been using discord for a while now and one of the features I absolutely love is the ability to create your own keybinds.