Hi there @Etasigma!
Sorry to hear about that. Being able to check your bill on the go is super important, we’re glad to help!
Are you able to check your bill successfully on the website?
If so, you’re application may be logging into an old User ID. When you combine your wireless and DirecTV bills, you are usually sent a new login ID and temporary password via email. That’s definitely worth checking into!
If you are using the latest login information, try uninstalling and reinstalling the application, that can help with all kinds of errant application issues!
Thanks for reaching out, have an excellent day!
Kevin, AT&T Community Specialist