Malfunction on Graph API on Update Events + GetSchedule

Maurice Lohse 0 Reputation points

Unfortunately there is currently a malfunction in the "Microsoft Azure Graph API" (

Error pattern: Room bookings can be edited via the Graph API, e.g. via PATCH '{id | userPrincipalName}/events/{id}', these changes e.g. to the subject of an event can be seen immediately in Outlook. If you continue to query '', however, the old subject remains visible. Only when a change is made, e.g. via Outlook/Exchange, can the change be seen again via the Graph API.

Is there a poll to fetch new data from Exchange's Graph API, or is it just a bug? The behavior has been present for about 4-5 days. Before running for 3 years.

Microsoft Exchange Online
Microsoft Graph
Microsoft Graph
A Microsoft programmability model that exposes REST APIs and client libraries to access data on Microsoft 365 services.
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  1. Ab-8756 800 Reputation points

    Hello Maurice Lohse,
    Thank you for your post.
    I have done some testing from my end too. I thought the issue could be related to propagation, issue but it's not.
    I was able to reproduce the issue from my end. I waited for 30 minutes after I made changes to the booking via Graph PATCH but the updated event info is not visible with '' call. It shows old Subject.
    The issue must be related to a bug therefore, I would recommend you create a support ticket by tagging Microsoft Graph.
    Here is the link to open a ticket;-

    Let me know, if that answers your question.