It is not possible for everyone to use Suomi.fi e-Authorizations on their own in the web service. For example, foreign companies, certain Finnish communities and persons assisting elderly or digitally-inclined relatives must submit a mandate application to the Digital and Population Data Services Agency.
The mandate application can be made without identifying yourself, but then you must print out the application, sign it by hand and post it to the Digital and Population Data Services Agency. If the application is to be signed and submitted to Digital and Population Data Services Agency electronically, the person making the application must identify themselves to the application.
For more detailed instructions on how submit a mandate application, see the page Granting mandates if you are unable to use electronic services.