You have been sent a participation status reply from an attendee for schedules items which were not found. It will be ignored.

Good day,

Everytime any invitee accepts my invites to a calendar appointment, I get this message “You have been sent a participation status reply from an attendee for schedules items which were not found. It will be ignored.”

The appointment on their calendar and mine are there, so there no reason why I would get it.

Anyone have any ideas?

Regards

Zak 

Is it possible that the invite was sent from an address other than the one associated with the calendar?

I have noticed this message appears no matter from what I send from - I tried Outlook, Mdaemon Webmail and EmClient - Webmail and Outlook don’t get the message but EmClient does. The appointment appears and accepts just the message doesn’t make sense why we get it. It happened on 3 people so far