Content
If it didn’t, a few targeted checks usually restore access—no need to keep resetting your password over and over. The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile. We start by checking that Azure AD Connect is running and password sync is enabled. If it’s in Staging Mode or a recent change didn’t trigger a full sync, passwords won’t update in Microsoft 365.
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.After performing these steps, Outlook’s all folders will be synced to the server.To get the sync working you will either need to delete users or have the user limit on your account increased.If password writeback isn’t enabled or the service account doesn’t have the right permissions, new passwords won’t update in Active Directory.This blog talks about the causes behind Outlook synchronization errors and a few solutions to fix Outlook sync issues.Check that your password change actually synced between your on-premises Active Directory and Microsoft Entra ID (formerly Azure AD).That tells us if the new credentials made it to the cloud directory.
Troubleshooting Microsoft 365 sync issues
This pops up a lot after admins reset a password in the Microsoft 365 admin center. That changes the password in Microsoft Entra ID, but not right away in your local Active Directory. You end up with mismatched passwords between the cloud and your local network. If you don't wish an inactive user to be made active by the M365 sync, you can add the user's email address to the sync forbid list. You can do this in the Microsoft 365 Sync Wizard on the configuration page of your platform settings. Knowing the reasons behind the Outlook sync issues will help us to fix this problem and prevent issues in communication and workflow.
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 Outlook Stuck on Synchronizing Folders 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
Now, we will verify the server settings to fix the Outlook synchronization error. Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not. The M365 sync establishes a synced dataset based on your M365 data and the filtering configuration of your sync.
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?
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. The Outlook data file cannot be accessed idea is to provide a recycle bin of users who you can delete when you no longer need them. You can view your inactive users on the Users page and delete them as you see fit.
Troubleshooting Co-Authoring and Collaboration Errors
On the sync server, we open the Synchronization Service Manager and check that the last sync finished without errors. Azure AD Connect handles password sync, but it runs on a schedule—usually every 30 minutes. So, if you just changed your password, there might be a short window where your old password still works and the new one hasn’t reached every system.
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
Before finding solutions, we suggest that users check their internet connection. Sometimes, Outlook sync issues can arise because of poor internet connection. If you are still facing this issue, kindly follow the solutions below to fix the sync issues in Outlook.
Keeping Azure AD Connect up to FixTechGuide mailbox repair steps date and testing sync regularly helps password resets flow like they’re supposed to. 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. 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.