We had the same issue as well. In our case we built our project locally using Xcode 12.5.1 and we were using Fastlane and Jenkins to deploy though AppCenter. The issue was that our Fastfile specified Xcode12.4 for building on the CI pipeline. Once we updated this to Xcode12.5, we were able to install the ipa files on iOS15 devices.
Almo
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