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This means that the authentication setup for your sync is no longer valid.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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The sync will fail if the groups you selected to load users from no longer exist in Azure AD.To diagnose and automatically fix several common Microsoft 365 sign-in issues, run the Microsoft 365 Sign-in troubleshooter.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.From sync errors to sign-in challenges and collaboration setbacks, these common Office 365 troubleshooting techniques can restore service quickly.These figures will give you an impression of how far over the limit the account is.
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 FixTechGuide mailbox repair steps 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
Contact MicroSec today and let our experts handle your Office 365 troubleshooting needs carefully and connection status shows disconnected 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?
For details see Identify directory synchronization errors in Microsoft 365. Real-time collaboration is at the core of Microsoft 365