Schedule Zoho Meetings - Email notification to participants does not have: Accept - Decline - Maybe

Schedule Zoho Meetings - Email notification to participants does not have: Accept - Decline - Maybe

When I schedule a meeting in Zoho Meetings, the participant's email notification cannot "Accept - Decline-or Maybe".  However, the email to me, the host, has this feature.

Consequently, I am not receiving feedback on attendance. This used to happen, so I suspect I have changed a setting but have been unable to determine where. 

I appreciate any advice on this.