What if customer doesn’t know where the Azure AD Connect server is deployed .
Find the MSOL Account on Users Container in Active Directory.
Copy the Description of the Account – you can find the Azure AD Connect Server Deployed on.
Account created by the Windows Azure Active Directory Sync tool with installation identifier ‘f9be57f6eab24e6b22222e69a’ running on computer ‘AD-CONNECT-SERVER01’ configured to synchronize to tenant ‘
azure365pro.onmicrosoft.com’. This account must have directory replication permissions in the local Active Directory and write permission on certain attributes to enable Hybrid Deployment.
if Server is moved recently and if they use the default Azure AD Service Account
You can login to Microsoft 365 Admin Center
Health – Directory Sync Status – Directory Sync Service Account may help on the server name