Hello,
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Near the bottom is info on HBO max.
Justin Wilson
j2sw@mtin.net
According to this page
https://help.max.com/US/Answer/Detail/000002518
They provide a “Contact Us” web chat in step 4 of Troubleshooting.
I have not used it to contact them but it does successfully launch a simple web chat client when I hit the embedded link.
You might check if it’s up to date on MaxMind and the like, HBO probably just pulls their data from one of those.