Starting Point I recently transferred an app from an old to a new developer account. The transfer itself went smoothly with the app using the following capabilities: CoreData, CloudKit, Push Notifications, In-App Purchases Keychain is not used After completing the app transfer, I worked on a new update. For this, I set the new developer account as the development team of the project in Xcode. However, as soon as I try to install the new version locally on my physical test device, I get the following error message: application-identifier entitlement string ({new_team_id}.{bundle_id}) does not match installed application's application-identifier string ({old_team_id}.{bundle_id}); rejecting upgrade.` (Note: The test device has the latest production version installed, which was still published by the old developer account. The update can be installed without any problems if no previous version is installed. {new_team_id}, {old_team_id} and {bundle_id} are a substitute for the original content.) What I've tried so far I found a Technical Note on this topic and followed the steps suggested. However, the Apple Support wasn't able to provide me with the required Special Provisioning Profile. That's why I tested a different approach with a dummy application: I have completed an update as described above (new developer account selected as development team). Next, I uploaded it to App Store Connect and published it as a new version. I received the following warning during the upload process, but ignored it since I don't use the keychain: At first glance, the publication process appears to have gone smoothly. While the update caused the above error during local testing, the update via the App Store went smoothly. As the latest production version has now also been published from the new Apple Developer Account, further updates can now also be tested locally on a physical device without any problems. Questions Why is it that the update causes an error when tested locally, but works without problems via the App Store? Can this approach also be used without concern for an app with a large active user base, which also uses the capabilities described above (in particular CoreData & CloudKit) without causing problems? Thanks a lot for your support in advance!