I have a problem with synchronization between our on-prem testing AD and Azure AD. We used password hash synchronization from our on-prem testing AD to our tenant in the past. Everything was working, but we wanted change PHS to ADFS. For this scenariowe have prepared new AD domain. So, I stopped synchronization of the testing domain and uninstall Azure AD Connect. Three days before I installed Azure AD Connect to the new AD domain and configured it for ADFS. The wizard was succesfully finished, ADFS andWAP servers were configured. Now, when I connect to the Microsoft 365 admin center, I see error message: Directory sync: last synced more than 3 days ago. In Health - Directory Sync Status, I can see the same error and in item "Directory syncservice account" is bad account, which doesn't exists. Azure AD Connect created during installation and configuration another account. Can I change the sync service account to the existing? Thank you very much for your advice.