It Takes Two does not require EA app anymore and its Steam Deck Verified now
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It Takes Two - Steam Friends and Deck Verified — EA Launcher No Longer Required - Steam News
https://store.steampowered.com/news/app/1426210/view/4150707902513320084
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.