I was actually helped through this by tech support. Here's what I learned: 1. You must use your @comcast.com credentials. 2. I had a previous account with Comcast that my phone was autopopulating in my internet cache, so clearing the cache teed up the correct account. 3. After sorting out the correct account, we reset its password, re cleared cache, and went through the typical process of reactivating my HBO go on my Xbox one where the expected "enter pin" page manifested. Hope this helps.
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