In version 3.13, single sign in enhancements were introduced to allow customer contacts to login to your company's default portal page and be redirected from there to their default portal.
Step Action
1. Use url (company name).orderprintnow.com/Login.aspx to open your company's default
portal page.
2. Login with Username and Password. The page will redirect from the main company portal
to the user's default portal.