Hello Zoho Team,
We send meeting invitations from Zoho CRM.
Many of our recipients use Outlook and therefore use the RSVP buttons from Outlook to respond. They rarely, if ever, use the RSVP buttons from the Zoho invitation.
Unfortunately, the meeting is marked as “unconfirmed” in Zoho CRM when the response is sent via Outlook.
I recently came across this post from four years ago, where the issue I described was marked as resolved: