try umute them if not then try find some info on google
have look at this link
I have tried to unmute them but its grayed out
it is to do with privacy setting on xbox change it to adult then try play again
Child settings are all off and I'm obviously not mute banned or whatever
So I'm stuffed then..... "Good game"
Privacy Settings again.
Look to see if Voice and Text is set to Everyone.
Problem solved for some reason voice and text communication had been to friends only, wondered why the last year of Xbox was so quite lollol