Does anyone know why half the games i get into, voice chat and text chat both dont work? it literally has ruined several of my competitive games and its been like this for a while.

My gunplay in general is good but my best guns seem to be sheriff/guardian and marshal/op. Should I try to get better at rifling and if so, any tips for someone who excels at one taps and crosshair placement? Rank is plat, hoping to get dia...