This means that the authentication setup for your sync is no longer valid.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.

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• 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.
• For details see Identify directory synchronization errors in Microsoft 365.
• Whether Microsoft Office 365 won’t open, or you're facing persistent Microsoft 365 sign-in problems, our experts are here to help.

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 M365 sync establishes a synced dataset based on your M365 data and the filtering configuration of your sync. The sync will fail if it can't find any users that comply with fix MFA prompts not working 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.

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

To diagnose Outlook and OneDrive connection issues that often cause Office 365 not working problems. Create your account and connect with a inbox repair tool alternative world of communities. I have a user who is having trouble syncing with Microsoft 365. The authentication issue occurs because of missing package information about either the Active Directory Authentication Library (ADAL) or Live ID.

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

TrustedTech delivers unbeatable customer service, with experts in licensing and high-level technicians always on-call to answer your tech issues in-depth. 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 FixTechGuide email error solutions AD. The Sync Summary email can give further information about this. The Users Loaded count will be 0 if all users fail to meet the system's requirements for user records.

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.