Appointments are created twice for invitees in Outlook when an appointment is created on Outlook for Mobile

Question

Appointments are created twice for invitees in Outlook when an appointment is created on Outlook for Mobile

Pöschl Markus 1

Hello all,

The following phenomenon: Many users have connected their mailbox to our Exchange via ActiveSync. Practically all of them have iPhones (i.e. the iOS applications Mail, Calendar and Contacts).
-> the synchronisation works perfectly

Now I have installed Outlook for Android and Outlook for iOS on some devices for test and evaluation purposes and also connected them to our (onPremise) Exchange ("identical" to the account settings for native synchronisation on iOS).

So far, everything works (mails, calendar, contacts -> everything syncs as it should).

If you now create a new appointment on the mobile device using Outlook Mobile, it also appears on the desktop as desired,

BUT: Everyone who is invited to the appointment always receives this appointment twice!
i.e. 2 identical, adjacent appointments are appearing in the invitees calendar -> If you delete the appointment as the creator, only 1 appointment is removed from the invited person, the duplicate remains. The issue is reproducible with every user !

What can be wrong here ? It concerns only Outlook for Mobile (whether Android or iOS), native ActiveSync tools (iOS) work.

Thank you very much !

Faery Fu-MSFT 19,751 Reputation points Moderator

2022-05-31T05:45:09.38+00:00

Hi @Pöschl Markus ,
Is there any update on this thread? If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well. Thanks for your understanding.

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Faery Fu-MSFT 19,751 Reputation points Moderator

2022-05-31T05:45:09.38+00:00

Hi @Pöschl Markus ,
Is there any update on this thread? If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well. Thanks for your understanding.

Answer 1

Faery Fu-MSFT 19,751 Moderator

Hi @Pöschl Markus ,

According to my search, I found that is a known issue in this official document: Multiple meeting invites are sent to attendees

Hope this can help you!

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Pöschl Markus 1 Reputation point

2022-05-13T13:34:10.543+00:00

Dear FaeryFu,

thanks for the quick reply.

The problem is: It doesn't matter whether I try Outlook for Android or Outlook for iOS
i tried each on multiple devices (Huawei, Samsung, iPhone 8,X,12, iPad etc.etc !) just to be shure.

The result is always the same in both worlds (Android AND iOS). The Invitee gets 2 Appointments in his calendar.
And the User himself gets the appointment normally (only once) synced in his calender.
Faery Fu-MSFT 19,751 Reputation points Moderator

2022-05-16T05:29:34.873+00:00

Hi @Pöschl Markus ，
Thanks for your reply.

This can happen in some cases where synching and accessing your mailbox and/or Calendar on multiple mobile devices(Andriod/iOS)is involved.

I think that you should start with disabling all the syncs that have been set up.
As I mention before, to work around this behavior, try to use plain vanilla Outlook for moblie and make any modification after saving or sending and see if you still are getting duplicates.

If this doesn't fix your problem. I recommend checking the article below to see other methods that may help you.

Calendar entries are duplicating
(Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
Faery Fu-MSFT 19,751 Reputation points Moderator

2022-05-18T08:47:45.557+00:00

Hi @Pöschl Markus ，
I am writing to check if you have tried the suggestions I mentioned before.
If you think my reply is helpful, please kindly mark it as answer, this will make answer searching in the forum easier and be beneficial to other community members as well.
Thanks for your understanding.

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Appointments are created twice for invitees in Outlook when an appointment is created on Outlook for Mobile

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