Using direct Tv login on network apps

When trying to watch a show on a network app on fire stick you are periodically logged out of your subscription which then requires you to log back in. When trying to log in to my carrier (Direct Tv) go through the standard prompts everything appears as usual, after entering the user name and password the next page is the accept terms as usual. When you click the box to accept the terms it now takes you to the ATT website and no longer routes you back to the app as logged in. I have now not been able to use my login credentials for 2 weeks!! Someone help!