its binded, my keycap is not broken, i can rebind it in game, just doesn't work. for example in game i have to press b to get out of buy and i cant get into settings to change audio stuff while in game. help

I just started playing valorant after playing csgo for a long time. In CSGO about 4/5 people have and use a mic in comp. In valorant its 2/5. Why is this? Why queue comp without a mic?