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This means that the authentication setup for your sync is no longer valid.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 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.The system requires that users have a first name, last name and a valid email address that conforms with your domain lock if enabled.You can do this in the Microsoft 365 Sync Wizard on the configuration page of your platform settings.Create your account and connect with a world of communities.Ive repaired the OST and changed cache mode to only cache 1 year.Another which is shown below, is a user opens a new message, or replies to one, and lets it sit for a while.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 AD.

I have multiple FixTechGuide Outlook repair tutorial users experiencing sync errors with Outlook and office365. Another which is shown below, is a user opens a new message, or replies to one, and lets it sit for a while. When they go back to the message and press send they get an error that the message has been deleted. Ive repaired the OST and changed cache mode to only cache 1 year.

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 Outlook Not Sending or Receiving Email 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