You plan to use Password Sync on your DirSync Server with Azure Active Directory {Azure AD) on your
company network. You configure the DirSync server and complete an initial synchronization of the users.
Several remote users are unable to log in to Office 365. You discover multiple event log entries for “Event
ID 611 Password synchronization failed for domain.”
You need to resolve the password synchronization issue.
Which two actions should you perform? Each correct answer presents part of the solution.

A.
Restart Azure AD Sync Service.

B.
Run the Set-FullPasswordSync Power Shell cmdlet.

C.
Force a manual synchronization on the DirSync server.D. Add the DirSync service account to the Schema Admins domain group.

Explanation:
On the computer that has the Azure Active Directory Sync tool installed, follow these steps:
1. Perform a full password sync for all users who are synced through directory synchronization. To
do this, follow these steps:
1. Open Windows PowerShell, type Import-Module DirSync, and
then press Enter.
2. After the Windows PowerShell session starts, run the following
cmdlet:
Set-FullPasswordSync
2. Restart the Forefront Identity Manager Synchronization Service. To do this, follow these steps:
1. Click Start, click Run, type services.msc, and then click OK.
2. In the list of services, right-click Forefront Identity Manager Synchronization Service, and then click Restart.

User passwords don’t sync if your organization is using Azure Active Directory synchronization
http://support2.microsoft.com/kb/2915221