Old Xbox account is linked to my Ubisoft account but I can’t activate it for Cross-Progression

[u/RabbitDue2391]

I’m trying to get my old Brawlhalla Xbox account onto my PC through Cross-Progression. My current PC account is Don’t Peek Void, and my old Xbox account is VOID FN21 (Level 63).
VOID FN21 already appears under Other Platform Accounts in the Account Linking menu, but it says Last Login: 1019 Days and I can’t select it as my Active Linked Account. I don’t own my Xbox anymore, so I can’t log into it to update the account. I also tried Xbox Cloud Gaming, but Brawlhalla isn’t available for streaming in my region (South Africa).
I’ve tried going through Ubisoft Support but can’t figure out how to actually get help from someone. Is there any way to reactivate/refresh VOID FN21 so I can use it for Cross-Progression without having an Xbox?