Outlook sync errors with Office 365 Software & Applications

While M365 is highly stable, it’s not immune to occasional disruptions.



Troubleshoot Office 365 Sync and Login Issues

This means that the authentication setup for your sync is no longer valid.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. To update from Azure AD Sync to Microsoft Entra Connect, see the upgrade instructions.

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



  • When they go back to the message and press send they get an error that the message has been deleted.
  • I have multiple users experiencing sync errors with Outlook and office365.
  • We have reset the router, checked internet speeds, signed in and out of M365 apps, reinstalled apps and checked for Windows updates.
  • 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.
  • Whether Microsoft Office 365 won’t open, or you're facing persistent Microsoft 365 sign-in problems, our experts are here to help.
  • 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 Users Processed count will be 0 is there are no users in the how to fix Outlook not opening today synced dataset after filtering. 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. 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.

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



The idea is to provide a recycle bin of users who you can delete when Outlook Login Issues Troubleshooting you no longer need them. You can view your inactive users on the Users page and delete them as you see fit. 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. With directory synchronization, you can continue to manage users and groups on-premises and synchronize additions, deletions, and changes to the cloud. But setup is a little complicated and it can sometimes be difficult to identify the source of problems.

Troubleshoot Office 365 Sync and Login Issues

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 Expert Outlook tips by FixTechGuide 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



Troubleshoot Office 365 Sync and Login 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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