I have the very same problem with some of my apps using a standard developer account. So this is not limited to enterprise accounts and apps. But this is not the same for all apps and all platforms.
All of my Apps fail to run with this error on my iPad Air 2 if these were installed under iOS 14 directly from XCode. Some will even fail if I install the AppStore or TestFlight version of the App, but some will actually work when installed from the AppStore or TestFlight. I do not see any pattern here, why some do work and some don’t (when coming from the AppStore).
And more strange: there are even Apps which fail when installed from the AppStore on the iPad, but does work without any issue on my iPhone (6s plus). So iPadOS 15 behaves differently than iOS 15.
Hopefully this is considered as bug and will be addressed by Apple in the next beta releases. At least the App releases from the AppStore should still run under iOS 15.
small addition to my post: after some more testing it turned out that the issue with the apps installed from the AppStore were caused by the AppStore failing to install the App or update properly. Even though the App appears on the homescreen and got a blue dot which indicates a new or updated App, the App was not installed properly and seems to be damaged. Deleting the App and installing from scratch again solved the issue (of course this is still bad because deleting an App will also delete its (user) data).
So the only remaining issue is that apps installed from Xcode before the iOS 15 release can fail to run.
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Developer Tools & Services
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General
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