I had the same issue. If you go online and search ATT watch TV you will get the website. Because of difficulties getting verified using my phone, I used my laptop and had a better experience setting up my account, however, I still could use my phone to stream. I went to the Contact Us link at attwatchtv website, online and chatted with a rep. They verified I am eligible and have the correct AT&T phone package to make an account for WatchTV. In the end they had to do a "hard reset to my account." Approximately 36 hrs. later, I was able to complete log in and am currently streaming with my phone casting to my Chromecast on my TV. Of note, you must use the phone that you used to set up the account with AT&T when you signed up. I have a family and 4 lines. I was using a phone which was not there phone number I had used to set up the account with AT&T. I don't know if that made a difference, but 36 hours later, I decided to use the phone that had the number used to make account through AT&T, not laptop, to see if all would work and it did. Good luck. It's a pain when you are using a new app that still has kinks in it. Hopefully, AT&T will listen to our problems and fix them.