Hey, really scratching my head over this…

Have 90 hours in GOG in witcher 3.
Just for convinience I bought the whole package again on steam to play on steam deck.
Logged in the Red launcher app with my GOG credentials, but it logs in still with my steam deck username and won’t have the cross savegames from GOG version.
I dont have a separate PC, so I cant do the manual tranfer of the save file.
Just in case I logged in the game with Geforce Now and enable cross-save thing there aswell. In the games main menu screen I also see my right gog name.

But on the steam deck the problem isn’t about cloud cross save, but rather I can’t log in with the right gog account, even when Im “signed up” and “claimed” my reward in the launcer thing with my original GOG credentials, it still shows my Steam account name in the main menu screen.

Any help?