Invitations are sent for an Engage Meeting Call. However, the error message: x of x attendees have not been invited displays in the My Schedule page.
After sending invitations, a user modifies the Call_Datetime_vod__c field of the Call object.
For an Engage Meeting Call, the Scheduled_DateTime_vod__c of the Remote Meeting is updated anytime the user updates the Call_Datetime_vod__c field. This is effectively rescheduling the Call and Remote Meeting. In the meantime, this also causes the CreatedDate of Sent Email to be earlier than the Scheduled_DateTime_vod__c on the Remote Meeting record.
For any Engage Meeting Call where the CreatedDate of Sent Email is earlier than the Scheduled_DateTime_vod__c on the Remote Meeting record (or there is no Sent Email record), the error displays.
Since the user reschedules the meeting, it is expected that a new email needs to be sent out so the warning message is displayed. Remote Meetings are typically tied to the Call Datetime field.
Avoid adjusting the Call_Datetime_vod__c field of the Call object after sending the invitations to prevent this error message from occurring.
CRM Help Documentation: Sending Engage Meeting Invitations via Approved Email
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