Peacock Subscription Won't Link

Hello,

The Peacock subscription that I get through my Gigabit internet subscription won't link to my Xfinity account. When I enter my email, it says that my Xfinity is already linked to another Peacock account. I think I know the account it's linked to, and it's one that I no longer have access to the email. It's a .edu email that I no longer have access to since I've been out of school for a bit. I want to delete that link so that I can link my current Peacock account, which is under my personal email address.