title: EWS findFolders throws : An internal server error occurred. The operation failed., IdAndSession.MailboxSession: session is not IMailboxSession
body: <p>I'm trying to find all folder is in EWS Public Folders (starting from Public folders root) and getting this strange exception :</p>
  
  <p>An internal server error occurred. The operation failed., IdAndSession.MailboxSession: session is not IMailboxSession</p>
  
  <p>Googling didn't provide any helpful information.</p>
  
  <p>Update (06 Dec 2018): issue disappeared after few day and now after 6 month back again, tried to talk with Microsoft Office 365 Engineer by chat, he said that seems that it's Office 365 bug, but not sure even if it'll be fixed. Very strange.</p>
  
  <p>Thanks</p>