Why won't Xfinity help me activate my Disney+/Hulu Bundle?

I signed up for my Xfinity Internet service at the end of March. It came with two years of the Disney+/Hulu bundle included, however I have been having zero success in being able to access it. When I started trying to activate it, I would click on the link through the xfinity.com/yoursubscriptions page or through the link texted/emailed to me by an Xfinity representative, and no matter which email address I used to attempt to log in to Disney+ to activate, I would get this message "You are attempting to activate an offer for a subscription through a third party partner. In order to complete the activation you will need to manage your existing subscription. Accounts must be managed separately. If you’ve recently canceled, you’ll need to wait until the end of your billing cycle to complete set-up." The problem with that is, I have not had a Disney+ account/service for over a year. I have used three different email addresses to try to activate and that was the message that I got every time. Now after going on two months of not being able to activate, when I click the link sent by the Xfinity representative, there's not even an activate button to click to attempt to activate. 

I have been on the phone with Xfinity agents for almost 14 hours (yes I have a spreadsheet) at this point about this one issue as well as multiple undocumented hours on the internet chat. Usually the phone conversation/internet chat includes an agent sending a link to my email and/or phone, which doesn't work, and then they create a ticket (I have had over 10 at this point) that is "escalated" and then closed with no follow through. The few times I have gotten any call back from an Xfinity agent, they suggest things to try that have not worked. For example, one suggested getting a Xumo box from the Xfinity store to activate, no success. Multiple have had me contact Disney+ and I have been on the phone with an Xfinity agent and Disney+ agent at the same time on four different occasions at this point. All parties have agreed that it's an Xfinity issue. 

No agent has been able to give me any useful information about why this is happening and none have helped at all, which is why I'm now turning to this forum in hopes that someone has some work-around for this issue. Thanks for your help if you can provide any.