he Siirto service must first be activated through your bank. You can find instructions for setting up Siirto with Nordea here and for Osuuspankki here.
Afterward, ensure from the Siirto, OP-Mobile, or Pivo app that your phone number is written exactly the same way as on your gaming account (including the country code +358).
As with all other withdrawal methods, you must use your own personal account.