We can help with this. To make sure that we are correctly getting this resolved correctly the first time, let's try some troubleshooting steps.
1. Try logging into your account on a computer. If you get a password error then you will need to reset your password. You can reset your password by following the steps located here in this article: AT&T Password Reset
2. After resetting the password, then try to log into the account on the computer. If it is successful, then the problem was the password.
3. Apply the account configuration(username and password) to the app and it should log-in.
4. You might also want to uninstall the app on your device. Turn the device and wait 30 seconds and then turn the device back on and then reinstall the app.
If those steps do not resolve the problem, then please return back here and we can do more troubleshooting.
Matthew, AT&T Community Specialist
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*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.