Print service is activated but the invoice ends up in error 'print service is not in use'

It is most likely that the country code (e.g. FI for Finnish addresses) is missing from the recipient's address.

Sending invoices by print service always requires at least the following recipient information:
- address
- zip code
- city
- country code
If even one of these are missing the invoice cannot be sent. Invoice can be resent from the invoice view to the correct address.