Event ID - 1004

Event Id1004
SourceMSExchange EdgeSync
DescriptionEdgeSync failed to confirm the credential for replication account %1 for subscription server %2. Please make sure Microsoft Exchange Credential Service (EdgeCredentialSvc) is running properly on the subscription server.    
Event InformationAccording to microsoft :
Cause :
This Error event indicates that the Microsoft Exchange EdgeSync service did not validate the future replication account credentials that are required to replicate Active Directory data to the Edge Transport server. The replication account and the target Edge Transport server are specified in the event description.
This Error event does not indicate that the replication account credentials that are currently being used are invalid. Instead, it indicates that the set of replication credentials that must be used next is not valid. EdgeSync performs this proactive check to verify that it can log on with the new credentials 15 days before the Edge Transport server will switch to the new credentials.
This may be caused if the future Edge Transport credentials have not been correctly propagated to the Active Directory Application Mode (ADAM) instance on an Edge Transport server.
Resolution :
No immediate user action is required. However, you must resolve this error before it becomes a problem. To resolve this error, do one or more of the following:
1.Make sure that the Microsoft Exchange Credential Service (EdgeCredentialSvc) is running on the target Edge Transport server.
2.Make sure that the replication account credentials are correctly propagated to the ADAM instance on an Edge Transport server. To do this, run the Exchange Management Shell cmdlet Start-EdgeSynchronization. This cmdlet forces EdgeSync to replicate the replication account data to the target Edge Transport servers.
Reference LinksEvent ID 1004 from source MSExchange EdgeSync

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