I just got off the phone with a representative. Even though my plan clearly states "HBO Max included," I was told that AT&T Wireless customers are not eligible for the full HBO Max. In order to watch this slim down version of HBO Max, I need to download another app called WatchTV which the representative sent a text with a link.

OMG....are you KIDDING ?!?  AND cannot use MS Edge browser ?? (see prev comments).  AT&T (Edited per community guidelines) so badly.

UPDATE: I now can access HBO MAX!!!!

I called 611 and spoke with Technical Support. The Rep advised me to do the following (they didn't stay on the line, but told me I should receive a follow-up call tomorrow):

1. Go to www.attwatchtv.com/verify (Use CHROME or SAFARI because MS EDGE is no longer supported on this site),

2. Follow the instructions to text the listed word to 2883 (or whatever four digit number it tells you to text). Once that's done, the screen will automatically refresh to look like this:

Note: for some reason, it didn't take at first, so I did Step 2 again, which worked.

3. Go to hbomax.com and follow the instructions -choosing TV or mobile provider. It will direct you to signin.att.com page. Here you should enter the same credentials used to access your bill. Once you put in the correct username/password, it will redirect you to play.hbomax.com (bypassing hbogo.com) so you can register your name and email address (Since I've already registered, I cannot show that screenshot). It also verifies you will be billed thru the provider. So, if you are applicable, you should not be charged.

4. Once this quick registration is complete, you will see this screen:

Since, I wanted to make sure that I wouldn't be charged (I'll keep checking my bill for awhile), I signed in to my AT&T wireless account and now it FINALLY displays:

This has been a frustrating experience. So, I sincerely hope this works for you! Let me know how it turns out.

Do you usually sign in to view your bill with your telephone number or the UserID that was made for you by AT&T?  I usually log in to view my bill with my phone number, however I used my UserID for the HBOMax verification process. I had to do it twice for some reason (per above instructions).

Thanks for your response.  I sign into my AT&T app using the assigned userID.  I have tried everything I can think of, but it no one other than AT&T will recognize and verify my account.  I’ve tried using other suggestions, such as logging in thru AT&T TV and Watch TV, to no avail.   I believe that there is an issue which is not within my control.

I agree. Try calling  AT&T's technical support.

After Navajo300’s suggestion, I contacted AT&T tech support.  After more than an hour on the phone, they “magically” fixed my problem and I finally have HBO Max!  I believe they “reset” my account after attempting several other options. I suggested that they post the resolution on this forum, but they explained that each situation is unique and that what they accomplished had to be done on their end.  Good luck to anyone experiencing this issue.  Patience is a virtue!

Well they'd better "magically fix" mine too without me calling & wasting any MORE HOURS, or I'm gonna keep bashing AT&T all OVER this forum until they DO !

I've totally HAD IT with this awful AT&T.  A (Edited per community guidelines) suit (again) is apparently necessary.  So sad...so evil...so criminal.