I have tired to purchase tickets and now I am given a code to copy and paste, when I do this on fandango website it says code no longer valid

I have tried numerous times to login to the AT&T THANKS app but it always comes back with "Uh oh. An error has occurred. Please check back later." I tried at different times. I tried on wifi or on the phone's data. I tried uninstalling and reinstalling the app. I reset my phone. None of this has wor

This is the 2nd Tuesday in a row I am trying to use the att thanks app to purchase movie tickets for Ticket Twosday. After selecting a movie and time and selecting get tickets it is still not connecting to Fandango. It just stays on the white screen I've attached here. Will not move past this screen