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https://thomascheng.net/2018/10/08/blackberry-contacts-stop-syncing-to-native-contact-app-on-ios-11-3-through-ios-12-device-provisioned-with-blackberry-uem-version-12-7-2/
Blackberry contacts stop syncing to native contact app on iOS 11.3 through iOS 12 device provisioned with Blackberry UEM version 12.7.2 through 12.9.1