Error with newly created Exchange Synchronisation:
 Error executing synchronization.
 Error executing workflow (Initial Synchronization) of synchronization project (Microsoft Exchange 2010 '[domain]' (recipients from [fqdn])).
 Error executing projection step (DynamicDistributionGroup) of projection configuration (Initial Synchronization (Initial Synchronization)).
 Error executing projection step (DynamicDistributionGroup)! [System.AggregateException] One or more errors occurred.
 The mapping rule (Domain <-> vrtDomainCanonicalName) was unable to execute the projection between system objects ([object]) and ([fqdn]) successfully!
 Property (vrtDomain@EX0DynDL) could not set the value ([domain]/) from system object ([object])!  Cannot determine the value for the property (UID_ADSDomain@EX0DynDL)! The value to convert ([domain]/) was not found in property (CanonicalName@ADSDomain)."
Assign a EX0Organisation to a forest in Manager:
Active Directory | Exchange System Administration | [Select Exchange System] | Change Master Data