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Opened Nov 22, 2025 by Ethel Lyons@ethellyons7382
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Office 365 Not Working? Fix It Remotely with MicroSec

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Boost your SMB’s security and compliance with Microsoft 365 Business Premium. Discover Defender and Purview add-ons for enterprise-grade protection at SMB-friendly pricing. TrustedTech is a Microsoft CSP Direct Bill Partner with all six Solutions Partner designations and decades of expertise in licensing, support, and cloud infrastructure. If you're looking for smarter ways to manage, secure, or optimize your Microsoft 365 (M365) environment, our U.S.-based team is here to help. Microsoft offers several built-in tools to help identify and resolve persistent issues. You will need to have the correct privileges set on your Azure account in order to set up the M365 sync.

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

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.Discover Defender and Purview add-ons for enterprise-grade protection at SMB-friendly pricing.You can do this in the Microsoft 365 Sync Wizard on the configuration page of your platform settings.Ive repaired the OST and changed cache mode to only cache 1 year.You run the Microsoft consent process using an eligible M365 account after which you will be taken to the sync's setup wizard.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.

If your Office 365 is not working properly because it’s outdated, support can handle update problems that prevent essential patches and security fixes from being installed. It seems to be some sort of error with the user not being able to connect and sync with M365 servers. This also started happening out of nowhere about a week Outlook OST vs PST repair ago. A vast community of Microsoft Office365 users that are working together to support the product and others.

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 FixTechGuide login issue guide 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.

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

After you run the commands, and if they completed without errors, you may see a quick progress indicator or Troubleshoot Office 365 Sync and Login Issues 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

While M365 is highly stable, it’s not immune to occasional disruptions. The sync will fail if the groups you selected to load users from no longer exist in Azure AD. Typically this is because the selected groups have been deleted from Azure AD since the M365 sync was configured on your account. To get the sync working you will either need to delete users or have the user limit on your account increased.

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Reference: ethellyons7382/outlook-ost-vs-pst-repair2021#1