When using Team Radio, your voice does not transmit. All the team can hear is a series of radio beeps. I first noticed this yesterday, and it's a real pain in a game in which communication is pretty important.
In the first case in the video below, it's happening to me. You can't hear the beeping, but a couple of players let me know they could (one muted me because it really is pretty irritating).
In the second case, it's happening to someone else so you can hear the beeping. If you pay attention, you can see that the player (Keanu Wick) says, "Got it." You can hear that just fine. The next instant, he tries to speak again but his voice doesn't come through, just the irritating string of beeps.