Sorry, my case was also due to not using team account.
The issue left could be the improvement of error messages or another way of UX design.
15 days ago:
iOS 13.x it showed “The operation couldn’t be completed.( EXNetwork error: 403).”
iOS 14.0.1 it only showed “could not load exp://exp.host/@[USERNAME]/[PROJECT_NAME]”
Maybe better to tell the users in Expo mobile client that only the app developer or team members can access the app.
Or, to display a notice in Expo iOS client that “you can only view your own app or your team own app” in the screen with app list.
Expo Team thank you for the response.