Welcome to the Community Forums! I definitely understand the concern with being unable to get passed the prompt to link account! I would be more than happy to help you with this!
The option to link your myAT&T accounts is available for customers who have multiple services with AT&T, such as wireless or Uverse. It allows access to all of your information with one username and password. The option to decline should be present, and any issues could indicate a problem with the application.
First, it will be best to make sure the app is running the most updated version. You can check for updates through the phone’s app store. The option to clear the cache and data is available on Android devices; or, you can uninstall updates and disable the feature. From there, a restart should correct any small bugs with the app.
I understand from previous posts, you were also experiencing issues with consistent alerts from a message which would not go away. This also indicates an issue with the application, in which case I would recommend uninstalling and reinstalling.
Please let us know if this helps! I hope you have a wonderful day.
Nicole, AT&T Community Specialist
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