First, the individual must be added to MaintMaster. See link below.
1. Open the person card and click on "Invite to MaintMaster". 
2. Select relevant settings such as permission and roles, and, possibly, language, stockroom and top site object as well
3. Click on "Next", check that the correct e-mail address is entered and complete the invitation process by clicking "Finish".
Click the link to learn more about adding a user or contact person to the system.