I'm using a Trusted Application to get the appointments in a specified period from a User. I can retrieve all of the information I want fine, except for the clientMessageId. Somehow this value isn't set or shown when I get the appointments.

This is what the view looks like:
getItemsRequest itemsRequest = new getItemsRequest();
itemsRequest.view = "subject startDate endDate place recurrenceKey recipients msgId clientMessageId peek";

I'm using 8.0, can someone explain why this ain't working?
or what I do wrong?