Hi Bryan,
I'm also experiencing the issue but running on 9.0 PL11 first time deployment.
Already reached several dead ends and pulling my hair off wondering what is wrong.
I tried troubleshooting tool and verified connection between mobile and server following SAP note: 1776825 but no problems found.
Just wanted to ask how are you able to downgrade to 1.2.1? I also wanted to check if this is also the cause but I wasn't able to do an APK backup . Would you mind sharing the 1.2.1 apk?
Thanks!
Best regards,
Rob