(I'm not just a PowerSchool administrator for one district, but I'm a PowerSchool parent for another 🙂 )
My employer district doesn't use Unified Classroom, but as a parent, my attending district does. I installed the app (for Android), I enter the 4 character district code, and I'm taken to the UC login screen. I log in (I know my account & password are valid because I can successfully log on via a real computer).
I'm taken back to the 4-character "enter the district code" screen. I do so. I'm returned to the UC login screen.
@JeromeO The district may need to resubmit the "Mobile Registration" page in the SIS - it refreshes the App and SIS connection. Have you connected with the district to see if it has been reported by multiple parents? I haven't seen any reports on our side.
Have you tried on another device (if you have one) to see if it is related to your device or the app?