Your Xfinity account is already linked to another Peacock account PPG_0017_0bea9fc

Tried to connect my xfinity account to peacock, but it keep saying "Your Xfinity account is already linked to another Peacock account"

Where can I unlink this "another Peacock account"?

Tried to ask live agent but it's not helping

I did some search and it seems this is an ever lasting known issue:

https://forums.xfinity.com/conversations/channels-and-programming/anybody-have-a-solution-for-your-xfinity-account-is-already-linked-to-another-peacock-account/65f0ae6328b6ea6548a33edb

https://forums.xfinity.com/conversations/xfinity-stream-website/peacock-premium-stopped-working-when-services-transferred-to-new-address-says-xfinity-account-is-already-linked-to-another-account/66a182308c8da0745ade89c8

https://forums.xfinity.com/conversations/signin-and-account-management/after-moving-i-get-this-message-when-setting-up-peacock-your-xfinity-account-is-already-linked-to-another-peacock-account/66a7a839465b5c4f1359f3de