You see the "You’re not authorized to use this method" message, because this web service is only available for the real-estate agent role. If you want to access this service, a special level of permission is required. Contact email@example.com to request permission from Boligmappa.
GetDocumentsByBoligmappaNumber2 web service also fails due to the following error:
239 - Invalid boligmappaNumber
The Boligmappa number you enter is mandatory for the GetDocumentsByBoligmappaNumberInput request to successfully call this web service. Verify that the boligmappaNumber you are using is a valid number.
Refer GetDocumentsByBoligmappaNumber2 web service for more details.