identifierForVendor changes on reinstall

Question

identifierForVendor is not supposed to change on reinstall of app:

The value in this property remains the same while the app (or anot

Answer 1

We are about to resubmit using an App Group entitlement to give us shared NSUserDefaults. It sounds like App Group NSUserDefaults (unlike keychain-access-group and iCloud key-value storage entitlements) are shared on the device, but not over the iCloud account. If the shared "deviceid" NSUserDefault key doesn't exist, we'll save the IdentifierForVendor ID and then use that for all our apps once it saved.