The agent wasn't able to help me but I was able to fix it on my own. You have to do it on the website, not any apps or anything that will open the app. Make sure you are logged out of HBO max on the browser as well. Go to xfinity, log into your account and search for HBO max. Once there, click on "Create HBO Account and Password". It will take you to "sign in through your cable provider", click on xfinity and it will automatically log you in to HBO Max. My billing went back to it being Billed Through Xfinity and worked on all the apps! Good Luck!
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