I finally figured it out on my own after a week of trying, on and off. Apparently, my email address is still associated with my old account from a different time I had comcast, and so that is the account it keeps logging me into. I finally found my current account number somewhere and was able to log in to that one and update my information. But I still can't set my email address for my current account because it is still associated with my old account.
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