Linked wrong account to Xbox Game Pass

Hi,

I have linked this account with Steam's EA Play back in 2020. And a week ago, I have decided go with Xbox Game Pass for PC and created a new EA account to link, because I totally forgot that I already had this account. Now realizing that I've made a mistake, I'm looking for a solution to unlink the newly created account with Xbox Game Pass and then re-link Xbox Game Pass with my old account.

My honest problem: I love Titanfall 2, and back in the day when I had Steam EA Play, I had grinded a good amount of time and made some progress through Steam EA Play. I don't know which platform, Steam or EA, stores my progress but I just want to see my progress & achievements. Tbh I don't really care which account is linked, I just want the achievements back. I don't even know if linking with the old account would restore my progress because it was via Steam EA Play. I could try unlinking my Steam from old EA account and then link it with new EA account but the system shows a scary popup which says scary things about progresses, so I couldn't go through with it.

BR,

Dilemma_11