When running a sync (using the SyncEngine) on a SharePoint 2013 environment an error occurs in the database. This occurred after adding a group (with many users in the group) and then running the sync.
The following error is visible in the [SyncEngine].[RunHistory] table in the AdditionalInfo column: “Invalid Request. The request XML is too complex”.
SharePoint 2013 uses CSOM calls that have a limitation when building the XML.