Cross progression now works, thankfully, although quite a few trophies seem bugged in addition to the ones they mention. Had some not unlocking that I knew I had fulfilled on switch, and then they randomly retriggered in weird ways. Like the upstairs downstairs one I had to stand on the roof and then it triggered.
Well, at least it’s working. Although it has been months since I last played and all this hassle - as well as having all my previously bought DLC unavailable (even though I can’t play the switch version anymore since that still crashes all the time) has left a bit of a sour taste in my mouth and I can’t seem to enjoy it anymore. 
Last night I tried seeing what Cross Progression gave me on Steam, from my PS5 profile.
I got the old Episode: Sapienza edition when they made it free and delisted it, so IDK if that has something to do with what I’ve found I could access in my inventory.
- Seems my inventory has all the mission mastery items, even if I don’t “own” them on Steam.
- It even has some bonus challenge unlocks like the Durian from Ambrose
- I don’t think I have all of them, but I noticed a few purple-streak Twitch items. I’ll have to double check.
- I have all the free Celebrity ET suits from playing them.
- I have all the current free Freelancer Mastery suits I’ve unlocked so far (level 80 something, plus Bruiser suit)
- In some weird bug?, the game also lets me access all the items/suits from the 7 Deadly Sins and Deluxe Pack DLCs, even though I don’t own them on Steam. Yay me?
- Other DLC items like the Trinity Weapons or Paid Celeb items aren’t. I’m guessing because the Sins/Deluxe items were tied to challenges, it considers it “progress” able to be transferred rather than content licences!
- The game auto-popped every single Achievement on Steam when I booted up the main menu, as that progress surprisingly transfered over. Neat, I 100%'d a game on Steam without trying!
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The Seven deadly sin stuff is given by challenges for starting or completing lv 1 or something like that so I guess that is why you still got them!
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I believe I did everything right, Ioi I linked on computer my nintendo account info and in the game itself.
I have the game basically on Nintendo Switch 2 and Xbox. I’m a Huge Nintendo fan and always wanted the Mario / Luigi and cosmetics.
I don’t know if the sync will work or how long before i see missions I have done on xbox, reflect on Nintendo