Both of our authentication methods can fail if the Enterprise Applications entry for the sync in Azure AD is deleted or if it has had its permissions modified. We go above and beyond the average software reseller because we built our business on trust. As active members in the IT community, we work to support our clients’ businesses and provide them with peace of mind. After these instructions, ensure the sync settings are correct and check everything is working well. For managed setups, we can push a PowerShell script with Intune or Group Policy to clear cached tokens on all devices. A quick look at the Microsoft Entra Connect Health portal helps us see if sync tasks are current and the connection to Microsoft 365 is steady.

• Bad settings in Azure AD Connect cause lots of password sync failures.
• Users can also convert OST files into various file formats, including PST, HTML, EML, MSG, vCard, etc.
• We show users how to reset passwords using approved methods like the Microsoft 365 portal or self-service password reset (SSPR).
• If someone changes their password only in the cloud or just on a local system, things can get out of sync pretty quickly.
• For managed setups, we can push a PowerShell script with Intune or Group Policy to clear cached tokens on all devices.
• Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
• We go above and beyond the average software reseller because we built our business on trust.

Troubleshooting Microsoft 365 sync issues

Similarly you should review the Users Deactivated sheet on the sync summary spreadsheet attachment as you can also delete these users to bring your total down. You'll also receive a mail (to the alternate email and to your admin email) from Microsoft 365 that indicates your tenant has encountered directory synchronization errors. For details see Identify directory synchronization errors in Microsoft 365. We also check the synchronization scheduler to confirm delta and full sync cycles finish successfully. We check that Microsoft Entra Connect (Azure AD Connect) runs the latest version and password sync is on.

Common Reasons Behind Outlook Sync Issues

If the old password still works, the reset probably hasn’t synced. To resolve these issues you should run the steps in this article and check Microsoft Outlook Email Repair Tool Online 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.

Address

Our training has quick guides about what happens after you update your password. For example, you might get signed out or have to reauthenticate on your phone. We also remind users to refresh their Office sign-in token by signing out of all Microsoft apps and signing back in with the new password.

Get Expert Help from TrustedTech

If you're looking for smarter ways to manage, secure, or optimize your Microsoft 365 (M365) environment, our U.S.-based team is here to help. In these cases, direct escalation to Microsoft or working with a Microsoft CSP partner, such as TrustedTech, can expedite resolution and minimize downtime. Our licensing engineers can help triage complex problems and ensure you're on the right support path. Microsoft offers several built-in tools to help identify and resolve persistent issues. A vast community of Microsoft Office365 users that are working together to support the product and others. TrustedTech is dedicated to being a reliable resource for all software and technology support needs.

What should I do if my sync failed due to authentication issues?

We also scan Event Viewer logs under Applications and Services repair PST file without data loss Logs → Directory Synchronization for Event IDs like 650–657 (for sync activity). Errors like Event ID 611 point to invalid replication data or outdated software. The error message in the Summary sheet of the Sync Summary spreadsheet attachment can also highlight the reason for this.



This means that the authentication setup for your sync is no longer valid. This can happen for the a number reasons particularly if your sync authenticates using Delegated Permissions. You will need to have the correct privileges set on your Azure account in order to set up the M365 sync.

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. Microsoft 365 is a robust platform, but when problems arise, fast resolution is key to productivity. From sync errors to sign-in challenges and collaboration setbacks, these common Office 365 troubleshooting techniques can restore service quickly. After performing these steps, Outlook’s all folders will be synced to the server.

Methods to fix Microsoft Outlook syncing error

Devices sometimes keep using cached passwords even after a successful sync. If users access multiple apps with the same login, we make sure Single Sign-On (SSO) settings line up so the new password works everywhere in Microsoft 365. 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 tell users to sign out completely and remove stored credentials from Windows Credential Manager or their device’s keychain.

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. Here, we will solve Office 365 mailbox sync delays discuss the five manual methods to fix sync issues in Outlook or OWA.