Years ago, I had no problem doing a voice chat with my partner. I think it was after an update that I lost that ability. In the TeamViewer 11 Manual page 61, it talks about transmitting audio to your partner and step 1 says "During a running session, click Communicate in the Remote control window." I don't know what the "Remote Control window" is, nor can I find the word "communicate" anywhere.
Can someone help me get back to the good old days when I could talk to my partner?