Checking to see if anyone else had similar experience. I started on SaaS without SSO and built my apps. I exported the apps out before moving to SSO as a backup.
Activated and now use SSO, however, I cannot access the app's Script Editor.
I changed owner to the new SSO user as a Professional user and no luck.
How does one recover the app with script editor enabled?
I remember having similar issue. Please try duplicating the app after importing. That has helped in my case.