If you are getting a Gateway Authentication Failure when trying to access U-verse content, it is likely due to one of the following issues:
1. You may not be using your U-verse username and password to sign in. Make sure you are using the correct login credentials.
2. You may be trying to access U-verse content from outside of the United States. U-verse content is only available within the United States.
3. Your account may have been temporarily suspended or restricted for violating our terms of service. Please contact us for more information.
Read the detailed guide here.