Fix Microsoft 365 Sync Issues: Expert Q&A Guide

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The system requires that users have a first name, last name and a valid email address that conforms with your domain lock if enabled.



Troubleshoot Office 365 Sync and Login Issues

You can close the wizard at this point as you do not need to complete it for re-authentication to take effect. You should run a test sync after re-authenticating the sync to ensure it is working. It could be due to incorrect login details, administrator password resets, or account lockouts after multiple failed attempts. Whether it’s a Microsoft Office 365 sign-in problem or a password reset issue, here’s how to get back in securely.

Top questions it leaders have about microsoft copilot (and how to answer them)



  • I have multiple users experiencing sync errors with Outlook and office365.
  • It seems to be some sort of error with the user not being able to connect and sync with M365 servers.
  • 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.
  • If that doesn't resolve your missing users issue, please follow our guide to troubleshooting missing users below.
  • We are a paid-for question and answer site and not affiliated with any other company.
  • For details see Identify directory synchronization errors in Microsoft 365.


If your Office 365 is not working properly because it’s outdated, support can handle update problems that prevent essential patches and security fixes from being installed. It seems to be some sort of error with the user not being able to connect and sync with M365 servers. This also started happening out of nowhere about a week mailbox not updating on IMAP ago. A vast community of Microsoft Office365 users that are working together to support the product and others.

I got an error message that my company has exceeded the number of objects that can be synchronized



Contact MicroSec today and let our experts handle your Office 365 troubleshooting needs carefully and Repair Outlook Profile Online professionally. A diagnostic tool that automatically detects and fixes common Office 365 problems. We have reset the router, checked internet speeds, signed in and out of M365 apps, reinstalled apps and checked for Windows updates.



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



Troubleshoot Office 365 Sync and Login Issues

After you run the commands, and if they completed without errors, you may see a quick progress indicator or troubleshoot Outlook synchronizing folders error a status result that contains information about the package installation. This issue occurs only on computers that are running Windows 10, version 1703 or later, and Microsoft 365 version 1807 or later. We are a paid-for question and answer site and not affiliated with any other company. I will be assisting you today and hope we can solve the issue together.

Tools & Methods To Use to Troubleshoot Office 365 Issues





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. The Summary sheet on the spreadsheet attachment of your sync summary includes an Updated User Count and User Limit. These figures will give you an impression of how far over the limit the account is. Sync failure alerts do not always include a full summary or attachment, you can run a test sync to obtain this data.
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