The create booking appointment API is returning an internalservererror

Ian Hirst 0 Reputation points
2023-04-14T12:56:53.58+00:00 I am posting a body request that has previously successfully worked, but am now getting the following response. Any ideas what's wrong?

    "error": {
        "code": "ErrorInternalServerError",
        "message": "An internal server error occurred. The operation failed., Unable to cast object of type 'System.Collections.Generic.List`1[Microsoft.Exchange.Data.StoreObjects.StorePropertyDefinition]' to type 'System.Collections.Generic.ICollection`1[Microsoft.Exchange.Data.PropertyDefinition]'.",
        "innerError": {
            "date": "2023-04-14T12:53:39",
            "request-id": "a27d3fa9-4048-477f-a0c0-b09fa519a6e0",
            "client-request-id": "c563c5f2-d101-6c7a-9abb-fe1ce81edd6c"
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. CharanyaB-MSFT 1,651 Reputation points Microsoft Vendor

    Hello @Ian Hirst,

    Thanks for reaching out!

    I am able to reproduce your issue locally, since, this seems to be a bug, I would recommend you report this bug by raising a support case with Microsoft, a dedicated Support Engineer will be able to assist you better. You can raise support ticket from or

    Hope this helps.

    If the reply is helpful, please click "Accept Answer" and kindly upvote it. If you have additional questions about this answer, please click "Comment".

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