As the vehicle owner, what change must you report to the relevant licensing authority?

You answered correctly. As a vehicle owner in Germany, you are required to report changes to your home address and your name to the relevant licensing authority. This ensures that your vehicle registration details remain up to date in the official records. However, changes to your third-party insurance do not need to be reported directly by you, as the insurance company automatically notifies the authorities. Remember, keeping your official information current is crucial to avoid complications with vehicle documents or fines.