Repeated calendar invites being received or sent - how to stop
Sometimes, iOS users will find that calendar invites that they create or update are sent/updated multiple times on calendars of people they have invited to a meeting. This seems to be caused by a sync issue with iOS.
(NOTE: this MAY not be limited to iOS 9x as it has worked to stop the problem on newer iOS devices)
Follow these instructions below, per an article online:
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"Why am I getting multiple responses from my meeting invitations in o365?
Office 365 users report getting multiple meeting response messages. This issue is caused when iOS 9x users accept meetings on either their iPhones or iPads with the native iOS Exchange Active Sync.
In order to fix this issue, the iOS user (who is sending the meeting acceptance messages) needs to turn off mail and calendar syncing on their mobile device and then turn it back on to stop the flow of the acceptance messages.
On the iOS device - go to Settings - Mail, Contacts, Calendar - Select the account - turn Mail and Calendar Sync Off - Choose "Delete from My Phone".
Wait a few minutes then turn the Mail and Calendar Sync back On. Note: It will take a while for everything to sync again.
Our general recommendations are:
When you receive a meeting invite wait a few minutes before accepting or processing it. Allow time for all your devices (phone, desktop, home) to get the message synced to them.
Do NOT accept/respond to meeting invites and updates from your mobile phone or device. Wait until you are at your desktop or log into the web client at Web Mail to respond from there."
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