Xbox app linked to someone elses EA account

This is beyond **bleep**.  So here is what happened:

Got Xbox gamerpass. Long time ago, I went to install the Command and Conquer Remastered game, and so when I went to install, it had me download the EA app and it automatically logged me into some other persons EA account.  How?  I have no clue. Neither does EA. Neither does Microsoft.

Fast forward many months later, still happening so I decide to do something about it.  I had full control of this other persons account, so I contact EA and let them know whats going on, and I wanted this other person to have their account back.  I assumed this would be the end of it.  Fast forward a few more months (today), and same thing, Xbox is logging me into a different persons EA account.  So I contact Microsoft, and let them know whats going on, and they swiftly tell me its an EA problem, nothing they can do.

So I contact EA today, give them the whole story, they inform me its a Microsoft problem, they cant do anything about it.  So after going round and round, they tell me to just unlink the Xbox account, but I keep telling them, there is no option to do so.  There is no button to unlink, only buttons TO LINK other platforms.  So they say "welp, nothing can be done.  Try posting in the forum".  So I did.  And I cant imagine anyone here can do anything.

Anyone else experience this? Super bizarre, but sure seems like it should be a simple "Oh, you got access to someone elses account, thats no good.  Let me unlink that so you can just link your own account."  But no, that would make too much sense.

Thanks for listening...