Moving while living abroad
According to Finnish legislation you have to inform the authorities if you are changing your address abroad. When your address information is up-to-date in the population information system, you ensure that you are notified of the right to vote at the time of the election. You can also get a passport faster. If your address is incorrect you may not receive contact from the authorities such as pension decisions or conscription letters.
You may also notify it in your country of residence via the local Finnish consulate, etc.