MS Bookings cannot create appointment

[astheo1002]

I've created custom connector using the Booking API. When trying to create an appointment, I get the following error: 

{

  "error": {

    "code": "InvalidModel",

    "message": "changes: Cannot create an abstract class.",

    "innerError": {

      "date": "2022-03-24T04:03:32",

      "request-id": "8bd7b2c5-e8bc-4077-affa-e7029261cce4",

      "client-request-id": "8bd7b2c5-e8bc-4077-affa-e7029261cce4"

    }

  }

}

This error only occurs when I add an existing customer (customerid) to the appointment but if I let the customerid blank, the flow works. Unfortunately, it is useless since I need the appointment to include the customer. 

Any help is appreciated...

[#2]

@astheo1002 

It worked for me when I included odata.type property in the request for customer information

{
    "customers": [
        {
            "customerId": "<GUID of customer id>",
            "@odata.type": "#microsoft.graph.bookingCustomerInformation"
        }
    ],
}

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