Hello and welcome to Apple Support Communities, Hallkj1965!
We understand you're having trouble with an app. We'd be happy to provide information that may help you address this.
Have you tried deleting the app and reinstalling it? It may help solve the issue:
Delete apps on your iPhone, iPad, and iPod touch
Also, if you have a VPN on your iPhone, try turning it off. Go to Settings and turn off the VPN switch.
If none of that helps yo solve this issue, you would have to reach out to AT&T again for assistance since this is their app: How to contact an app developer
Have a great day!