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This means that the authentication setup for your sync is no longer valid.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 idea is to provide a recycle bin of users who you can delete when you no longer need them.The M365 sync establishes a synced dataset based on your M365 data and the filtering configuration of your sync.You can run a Manual Sync from the Microsoft 365 Sync page.You will need to have the correct privileges set on your Azure account in order to set up the M365 sync.The error message in the Summary sheet of the Sync Summary spreadsheet attachment can also highlight the reason for this.The Sync Summary email can give further information about this.It could be due to incorrect login details, administrator password resets, or account lockouts after multiple failed attempts.
The Users Processed count will be 0 is there are no users in the Outlook Profile Repair And Recovery Steps 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
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What should I do if my sync failed due to authentication issues?
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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.