My friend and I both purchased this for PC. Neither of us can invite each other. We tried in custom games and in public matchmaking… No success. We also tried inviting with mouse and with a controller. Crazy how this game worked better during Beta than it does during full release.

You actually have to be in the Friends tab on HG to see the invite come in. Seems counter-intuitive to hide it away. Would have thought a notification would have been better.