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EWS with oAuth "An internal server error occurred. The operation failed."
Hi... Since yesterday, my synchronization application starts throwing exceptions with the following error "An internal server error occurred. The operation failed." It only happen for mai...
I've found out that the problem can be solved by added a header after setting ImpersonalteUserId
service.HttpHeaders.Add("X-AnchorMailbox", mailbox.Mailbox);
Thanks for sharing. This solved our issue as well