I've setup a dozen or so Assigned Access Windows 10 systems (MS Kiosk) in the past. A recent system purchased required a Kiosk interface but the kiosk consistently fails to start.
"We weren't able to start your app. Press Ctrl + Alt + Del to sign out or contact your system admin. For more info, search online for error code 0xffffffff."
Specs:
Windows 10 19042.685, 20H2
Celeron N3450 Processor
8GB memory
128GB storage Space