Greetings @marcia3x!
We always want to ensure our customers are able to gain access at any time into their online account. I would love to follow up with you in order to assist you with this problem.
Since the issue started, have you attempted to clear cache and cookies from your browser? I also suggest using an alternate browser from the one you are currently utilizing. For example, if you are using Internet Explorer, try Mozilla FireFox or Chrome.
Have you also tried to remove or stop the app from your phone, and then re-add? To learn how to do this, please click here. Select your make and model phone, click on View all Tutorials> Apps to get started.
If you are still having issues, please send us a private message to @ATTMobilityCare. We would love to work with you further on this problem!
Have an excellent rest of your week and I hope to speak soon!
Shenoah, AT&T Community Specialist