Activate Peacock subscription on new TV box

I just changed to a new satellite X1 box, and I am trying to get re-connected to my streaming services. I activated Peacock Premium as a reward for being a Diamond member some time ago. I can still access Peacock on the main X1 box, but I want to activate it on the new satellite box so that I can watch Peacock on that TV. I'm not sure how to go about it. I spoke with a customer service agent who suggested I go through the activation process again. However, the Xfinity Peacock activation webpage tells me Peacock is already activated, so I cannot repeat the process. Another agent suggested that I simply needed to sign in to Peacock on the new box. I tried that, but Peacock does not recognize my login credentials as valid. (I do not recall setting up a login and password when I first activated Peacock, so I tried my Xfinity email as well as my other email address, but neither was recognized.) Peacock has an option to pursue if you do not remember your email and password where it asks for your name, but it tells me there is no Peacock account under my name. So, I am stumped as to how to proceed.