We have a customer using our software to connect to outlook.office365.com via EWS. The application creates messages in the user's mailbox. We are seeing intermittent http error 500, with the fault string "Exchange Web Services are not currently available for this request because none of the Client Access Servers in the destination site could process the request.". The software then retries the request, and usually succeeds. I have not seen this error with other customers, just this one. Why does that happen, and what can be done about it?
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