The sync will fail if it can't find any users that comply with your filtering preferences or the system's requirements for user records. The system requires that users have a first name, last name and a valid email address that conforms with your domain lock if enabled. The sync does not delete users but rather sets them to inactive. The idea is to provide a recycle bin of users who you can delete when you no longer need them.

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Outdated credentials get stuck on devices, password sync gets turned off, or Microsoft Entra Connect just doesn’t update like it should. Here’s a step-by-step approach to help you spot the issue, fix it, and avoid these sync delays down the road. While M365 is highly stable, it’s not immune to occasional disruptions. We also check the synchronization scheduler to confirm delta and full sync cycles finish successfully.

What to do when Office 365 password reset doesn’t sync across devices

To resolve these issues you should run the steps in this article and check whether the groups in your sync's filtering preference contain users in Azure AD. The simplest way to resolve authentication issues is to rerun the authentication process by clicking the Sign in with Microsoft on the Microsoft 365 settings page. You run the Microsoft consent process using an eligible M365 account after which you will be taken credential loop in Microsoft 365 to the sync's setup wizard. You can close the wizard at this point as you do not need to complete it for re-authentication to take effect.

Login Sync Errors: Personal Business Microsoft 365 Accounts on Same Device

But setup is a little complicated and it can sometimes be difficult to identify the source of problems. We have resources to help you identify potential issues and fix them. With apps syncing across devices and cloud services, sync issues are among the most frequently reported M365 problems. These can include missing files, ghost icons, or documents that do not update in real-time. The sync will fail if the total number of all users (active or inactive) on your account exceeds the user limit placed upon it if present.

Reviewing Device Sign-In Settings

Waiting a few minutes after changing the password often clears Fix Outlook Not Opening After Windows Update up short-term sync issues. We look at audit logs in the Microsoft 365 admin center to see when and where the password changed. That tells us if the new credentials made it to the cloud directory. We usually check settings like Password Writeback, Synchronization Rules Editor, and Service Account Permissions to spot misconfigurations. Sometimes a missing or outdated connector blocks the link between Microsoft Entra ID and your local domain controller.



Password sync usually fails when credentials don’t update between Microsoft Entra ID (Azure AD) and your on-premises Active Directory. Most of the time, the problem comes from timing delays, configuration mistakes, or cached credentials on devices that don’t pick up new passwords. We check that Microsoft Entra Connect (Azure AD Connect) runs the latest version and password sync is on. Keeping things updated helps avoid compatibility issues between on-premises Active Directory and Microsoft 365. If problems stick around, we rejoin the Office 365 Sync Errors Fix devices to Microsoft 365 services.

• If problems stick around, we rejoin the devices to Microsoft 365 services.
• We also scan Event Viewer logs under Applications and Services Logs → Directory Synchronization for Event IDs like 650–657 (for sync activity).
• Running the Azure AD Connect Health tool gives you alerts for sync errors and interruptions.
• For managed environments, we use Intune or Group Policy to force sign-in credential sync and clear old tokens.
• You can stop any accounts from being brought over by adding them to the sync deny list.
• Users I create within the Office 365 portal are fine, so I assume it is something to do with Azure AD Connect.

First, we check that the password reset finished in Microsoft 365 or Microsoft Entra ID. The user should log in to the Office 365 web portal with the new password. If the old password still works, the reset probably hasn’t synced. To avoid this, double-check that password writeback is turned on and working. You can run a sync manually with PowerShell or the Azure AD Connect tool to make sure updates go through. Checking the sync logs helps confirm password changes are making it everywhere they should.