I don't know why, but the send button remains greyed out trying to send messages like "glhf" or "gg" or similar, or even just letting them know you may be a second while you think. I am trying to communicate to the opponent, and this is a fundamental part of being a courteous player. The first message wouldn't go through for like 7 tries, and the follow up message just never went through and after 2 mins of trying, it was futile so I concede the game. We basically didn't even get to start because it was too frustrating to try and play without, and I refused to play without it.