Invited new users being put into "trial" accounts that have no ability to access shared applications

Invited new users being put into "trial" accounts that have no ability to access shared applications

Help!  Starting today, my invitations to new Zoho users with whom I have shared my applications can no longer access them.  They never see the "dashboard" screen - only the screen that prompts them to start creating their first application.  They have to "upgrade" to a paid subscription in order to see my shared applications.  I am supposed to have unlimited users on my subscription.  Please advise ASAP!