Wildlands is probably the best coop experience I've had in a game in any recent years. You can play coop from the very beginning, you don't have to wait for a tutorial to end and either player can go anywhere on the map at anytime. Not like in far cry where you have to stick together. If you like tactical shooters Wildlands is great. It's a lot like far cry games but I'd say better.
On game pass; Trailmakers is cool. It has an interesting coop mode where you have to collect different parts to build your vehicle with, which then allows you to get more parts. A unique game for sure.
Raft is a great coop game. Build a raft out of junk and try to survive/expand/explore.
Overcooked 1 and 2 are both fun coop games.
Lovers in a dangerous spacetime is a little older, but really fun.
Factorio and Satisfactory are both great coop factory building games.
Stardew valley is great for a relaxing coop game.
On game pass; grounded is a cool one. Still early access so it ends quick but still fun/unique.
These are just what come to mind as recent-ish games I've played. There are a lot of coop game on game pass I haven't tried.
I've been playing far cry 6 coop lately and it's ok, not great. The coop is limited. The second player has to stay close to the first and can't unlock items in all the same ways as the first player. If you haven't played Wildlands and your thinking about trying far cry 6 for the coop, play wildlands instead for sure.