Unable to use HBO max

Happy to help you sign in to HBO Max, Gimdornim.

Try the following troubleshooting options from our article on How to stream HBO Max:

• Make sure you activate HBO Max through your myAT&T account. Once logged in, you'll see an option to Get Started.
• If you don't see the option to Get Started, go to http://att.com/acctmgmt/startwatchinghbomax.
• Try using a computer for registration. You may need to clear your cache and cookies.
• Make sure you're using the right login. It will be the same one you use to view your myAT&T account.

If you're still getting the error message, let us know if you recently upgraded to Internet 1000, or moved your service to a new address. We're asking because

if you upgrade or change your AT&T Internet plan, or if you move to a new address, you will lose HBO Max.

We'll be awaiting your response.

Aminah, AT&T Community Specialist

I tried the links you provided but they just linked me to the overview page. I recently moved into an apartment with existing AT&T equipment and a community plan. When I select My internet service on the overview page, I can see an item that says

My applied discounts & offer
Connected Communities Offer

Started on Jul 27, 2019

HBO Max Included

Started on May 27, 2020

DIRECTV STREAM Internet Bundle Pricing

Started on Jan 27, 2021

U-verse TV and Internet Unlimited Usage Plan

Started on Jul 01, 2022

So it appears that I should be able to use HBO Max?

Thanks for the additional information, Gimdornim.

We're going to have to take a look at your account, so we can try to pinpoint the exact reason you're unable to sign in.

We'll be sending you a Direct Message to get started. Look for the chat icon next to the bell icon in the upper right corner of the page.

Talk to you soon.

Aminah, AT&T Community Specialist

Ever get this sorted? I am having the same issue and neither ATT nor HBO can figure this out.

It looks like I have the same problem. 

https://forums.att.com/conversations/att-fiber-account/cannot-activate-hbomax-even-though-it-is-included-with-my-internet-1000/630401be4a366c200e4e72ce

I think the problem is that HBOmax marks your subscription as expired, so the account still exists and AT&T cannot create a new account when you try to activate. 
Someone probably needs to reset a flag in one of the systems.