Here is the another common error message when dealing with directory and password synchronization.
Error Message:
Your account is temporarily locked to prevent unauthorized use. Try again later. Contact Customer Support if the problem persists
Resolution:
Make sure the directory synchronization service account has proper permission in AD. Permission details are documented in this article – https://azure.microsoft.com/en-us/documentation/articles/active-directory-aadconnect-account-summary/
The above error message is related to Replicating Directory Changes and Directory Changes All permission in AD.
From https://azure.microsoft.com/en-us/documentation/articles/active-directory-aadconnect-account-summary/ “If you intend to configure password sync to Azure AD, ensure this account has the following permissions assigned: -Replicating Directory Changes -Replicating Directory Changes All”
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