You get this error when you are invited by someone but you have not yet accepted the invitation. Whenever you are invited to join Galaxkey an invitation email is sent. This email is sent to make sure that invitation is accepted by the intended recipient. Please look for the invitation email in your Inbox. If there are spam filters or any rules set for incoming emails in your enterprise, please make sure the email is not filtered out.
Open the invitation email and click on the "Accept Invitation" link in the email. Set up your Galaxkey password. Restart the outlook and double click the Galaxkey secured email. It should now challenge you with the password and open secured email on successful authentication.