Visma Sign's frequently asked questions Why does the invitation authentication fail? Which nationals can sign documents with Visma Sign? How do I add a user to my Visma Sign Account? What is the difference between strong and light authentication? On which laws and regulations are electronic signatures based? How do I register a company, if I already have a user account? What are Visma Sign Forms? Can I create and fill in a form with a mobile phone? Why does the signature not show on the document?