A friend of mine bought the game on microsoft and I own the steam version. We could not find any possible way to invite each other to a match. When I click on the “invite team mates” button, only a blanke window opens, and when he sends me invitations via xbox, i can’t accept them. So unfortunatelly it’s impossible for us to play a ranked game together.
It would be great, if invitations worked just like in the original aoe3-game, where you could simply click on a friend in your friends list to invite him or her to a match.