End users are unable to login

End users are unable to login

We have been trying to setup Zoho Desk for about a month.  That being said this has been the worst possible SaaS software to setup.  The locations for buttons and settings are not intuitive and often require a google search to locate. 

However, this issue has baffled me and I cannot find a link to anyone else who has this issue and when I call the support line they hang up on me before I even get a chance to talk.

We just tried to release our portal to our customers and found that when users are created and links are sent the users can click the link but when they try to login the login screen just refreshes and appears again.  Try to reset the password and the link is dead.  Try to login with incorrect password and the incorrect password shows up in red letters so I know the password is correct.  When I check the setup page all of my users show up in the INVITED USERS not the ACTIVE END USERS tab.  If I try to resend the link it fails.  Kind of at wits end here as we migrated to the full suite of Zoho products: CRM, Books, Inventory, Reimbursement, Desk.