If your using a the US save then it wont work. With the elex being unsupported by SW it is super hard to re-region a save and not have it corrupt. So the EU will work if you can create a EU account then download the game the save should work or you could get a EU hardcopy other than that IDK if there is a way to get the save.
That's unfortunate - I actually sent multiple US saves for Elex to SW a long while ago, but nothing yet... It's not a bad game, just a bit janky, but I guess not enough people requested it. Oh well, it was worth a try I guess.