Outlook API Sends Duplicate Event After Editing Recurring Series

Question

We observed a potential bug in Outlook Web during testing of an integration between our software and Outlook Calendar. Our software uses Graph Platform API.

One of our client performed the following actions using Outlook application:

1-Created a recurring series starting on December 18th with 10 repetitions — this was correctly reflected in our software.

2-Removed a single day from the series — correctly updated in our software.

3-Removed multiple days from the series — also correctly reflected in our software.

4-Deleted the recurrence from the series, leaving only the calendar entry on December 18th in Outlook.

Here, two reservations appeared for December 18th in our software.

5-After removing one of the duplicated entries, both reservations in our software disappeared.

 

Issue: In step 4, Outlook Web temporarily displays a duplicated event on December 18th. Although refreshing Outlook Web removes the visual duplication, the Outlook API continues to send the duplicate, causing our software to misinterpret it and display it incorrectly.

 

We have a screenshot showing the duplicated event in Outlook Web.

Any help would be greatly appreciated!

Thanks.

Answer 1

Hi Elif Dogan,

According to my search, the Graph API can currently only be used to update an entire family of loop events, or to modify individual instances; unfortunately, there is currently no support for updating only selected events and subsequent events. This could be the cause of the problem.

Since your issue is more related to Microsoft Booking, please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client. In order to better solve your problem, it's suggested that you could post your case in dedicated forum for Microsoft Graph for more professional advice.

Thanks for your support and understanding!

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