SFSafariCorrespondingIOSAppBundleIdentifier
A string bundle ID that identifies the corresponding iOS app that contains a content blocker or Safari web extension.
Discussion
To enable extension syncing for your macOS app that contains a content blocker or Safari web extension, specify the bundle ID of the corresponding iOS app that contains the same content blocker or Safari web extension.
Only add this to your Info.plist if the bundle ID for your macOS app is different from the bundle ID for your iOS app.
For more information, see Syncing Safari web extensions across devices and platforms.