In case of cancellation after the expiry of the applicable refund period, the airlines will not reimburse the amount, except for cancellations due to illness or death.
<a href="https://www.cancelation-policy.com/finnair-cancellation-policy">Finnair Cancellation Policy</a> says If a passenger wants to cancel their reservation within 24 hours of the flight departure, it cannot be done. Users are granted privileges under special circumstances. But the same passengers have to communicate with the agents.
https://www.cancelation-policy.com/finnair-cancellation-policy