Unable to Assign 'Attendee' Role to Contacts

Why am I unable to assign the 'attendee' role to contacts when I can assign 'speaker' and 'moderator' roles successfully?

In Dryfta, assigning the 'attendee' role to contacts requires available attendee credits. 

While roles like 'speaker' and 'moderator' do not consume attendee credits, the 'attendee' role does. If you are unable to assign the 'attendee' role, it is likely because all your available attendee credits have been used. 

To resolve this, you need to purchase additional attendee credits from the billing page within your Dryfta administrator panel.