Thought I’d give Red Dead 2 another play, previously completed it on xbox.

Downloaded it to the Steamdeck, went to launch and it asks me to login to R* Social, log in to what I thought was the right account. Get a message saying that my steam account is linked to another social account, I recalled playing GTAV on my PC about 9 years ago (since sold pc).

I have no idea what the Social login was! so now I can’t play it. Frustrating as I’m not interested I Red Dead online, just want to play the single player again. I assume there’s no way to find out the linked account from Rockstar?