Event ID - 1221

Event Id1221
DescriptionDuring intersite replication, the directory replication agent (DRA) received an invalid backsync update-replica message for naming context <object name> from the directory at <object name>. This Site Replication service is not backsyncing or does not replicate to that directory.
Event InformationAccording to Microsoft:
Explanation :

The foreign directory is not in the destination foreign directory replicas list for the named object. All requests from that directory will be ignored.The directory replication agent (DRA) is responsible for synchronizing with the other directories and accepting directory updates.
User Action :
Verify that there are no inconsistencies in the replication connectors. Examples of inconsistencies include moving a bridgehead or deleting a replication connector between the two directories.
Reference LinksEvent id 1221 from source MSExchangeSRS

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