[SUPPORT TROUBLESHOOTING] RPC Error 8453 Replication access was denied in Azure AD Sync Services #AADSync

Quick post to describe a common layer-8 issue. You’ve installed Azure AD Sync Services (AADSync) 1.0.0470.1023 (or later) and have setup password hash synchronisation, i.e. you are synchronising users and their passwords as opposed to creating federated users. Password synchronisation doesn’t appear to be working and you find the Event ID 611, source Directory Synchronization,… Read more