Today’s update for It Takes Two adds support for Steam Deck and game invites through the Steam friends list, and removes the need for the EA App launcher.
Wow, literally just got my wife a steam deck to play this game with me and created her an EA account last week. Joining each other was annoying using the EA friend's list and the steam deck trackpad. Hope this update streamlines the process.
Update: Invites using the Steam friend list was simple and worked well.