"Sequence contains no matching element" Exchange Synchronization error occurs during Journals Synchronization phase

SYMPTOMS

The following message is logged at FATAL level during Journals Synchronization phase.

ZyLAB.EDiscovery.Exchange.Standalone.ExchangeSync.ExchangeSynchronizer - Error while synchronizing journal items from mailbox journal System.InvalidOperationException: Sequence contains no matching element    at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)    at ZyLAB.EDiscovery.Exchange.Standalone.ExchangeSync.EwsFolderManager.GetFolderNode(ExchangeFolderNode root, WellKnownFolderName wellKnownFolder)    at ZyLAB.EDiscovery.Exchange.Standalone.ExchangeSync.EwsFolderManager.GetAvailableFolders(WellKnownFolderName[] folders)    at ZyLAB.EDiscovery.Exchange.Standalone.ExchangeSync.ExchangeSyncHelper.SynchronizeJournalItems(CancellationToken token, IJournalMailboxConfiguration journalMailboxConfiguration, WellKnownFolderName[] wellKnownFoldersToSync)    at ZyLAB.EDiscovery.Exchange.Standalone.ExchangeSync.ExchangeSynchronizer.SyncFromJournalingMailboxWorker(CancellationToken token, BlockingCollection`1 emailAccounts)

CAUSE

Exchange Throttling Policies configuration.

RESOLUTION

Depending on the Exchange version in use, the user mailbox or the impersonating user are associated to an Exchange Throttling policy with too restrictive Exchange Web Services (EWS) Throttling budgets.

It is possible to confirm this by checking the EWS logs.  Should it be required, do not hesitate to contact Microsoft or ZyLAB Support to receive assistance with this investigation.

EWS throttling in Exchange
https://msdn.microsoft.com/en-us/library/office/jj945066%28v=exchg.150%29.aspx

APPLIES TO

3.7; 3.7 Service Pack 1