How to Troubleshoot Common Microsoft 365 Problems and Issues

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Troubleshoot Office 365 Sync and Login Issues

Microsoft offers several built-in tools to help identify and resolve persistent issues. You can stop any accounts from being brought over by adding them to the sync deny list. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. I'm considering deleting as many objects from the tenancy as I can, and starting from as close to the beginning as I can. Even I've only been doing this with test users so far, so haven't actually broken any actual users yet, I still need to get this resolved quickly. A vast community of Microsoft Office365 users that are working together to support the product and others.

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Troubleshoot Office 365 Sync and Login Issues

Real-time collaboration is at the core of Microsoft 365; however, issues can arise due to permissions, software version conflicts, or connectivity problems. Find out what to do if you are having issues with syncing users or groups from Microsoft 365. It seems to be some sort of error with the user not being able to connect and sync with FixTechGuide Windows update Outlook Fix M365 servers. We also scan Event Viewer logs under Applications and Services Logs → Directory Synchronization for Event IDs like 650–657 (for sync activity). Errors like Event ID 611 point to invalid replication data or outdated software. On the sync server, we open the Synchronization Service Manager and check that the last sync finished without errors.

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Troubleshoot Office 365 Sync and Login Issues

Azure AD Connect handles password sync, but it runs on a schedule—usually every 30 minutes. So, if you just changed your password, there might be a short window where your old password still works and the new one hasn’t reached every system. At NetTech Consultants, we help organizations keep Microsoft 365 running smoothly and securely. We go above and beyond the average software reseller because we built our business on trust. As active members in the IT community, we work to support our clients’ businesses and provide them with peace of mind.

Reviewing Device Sign-In Settings



Troubleshoot Office 365 Sync and Login Issues

You can view your clear Outlook credentials manager 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. If sync keeps failing, we make sure the Microsoft Entra Connect service account has the right permissions and the server connects to the domain controller. Updating Azure AD Connect to the latest build often fixes known sync issues.

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Password sync usually fails when credentials don’t update between Microsoft Entra ID (Azure AD) and your on-premises Active Directory. Most of the time, the problem comes from timing delays, configuration mistakes, or cached credentials on devices that don’t pick up new passwords. We check that Microsoft Entra Connect (Azure AD Connect) runs the latest version and password sync is on. Keeping things updated helps avoid compatibility issues between on-premises Active Directory and Microsoft 365. If problems stick around, we rejoin the fix Outlook after Windows update issues devices to Microsoft 365 services.



  • We go above and beyond the average software reseller because we built our business on trust.
  • TrustedTech is a Microsoft CSP Direct Bill Partner with all six Solutions Partner designations and decades of expertise in licensing, support, and cloud infrastructure.
  • Discover how IT leaders can address key Microsoft Copilot questions on cost, deployment, security, and integration to maximize ROI and adoption.
  • To get the sync working you will either need to delete users or have the user limit on your account increased.
  • I'm considering deleting as many objects from the tenancy as I can, and starting from as close to the beginning as I can.
  • That changes the password in Microsoft Entra ID, but not right away in your local Active Directory.
  • When configuring Azure AD Connect, I chose the options for Pass-through Auth + Seamless SSO + Password Hash sync.


You should run a test sync after re-authenticating the sync to ensure it is working. Devices sometimes keep using cached passwords even after a successful sync. If users access multiple apps with the same login, we make sure Single Sign-On (SSO) settings line up so the new password works everywhere in Microsoft 365. If there’s a delay, we manually trigger a password sync using Microsoft Entra Connect.
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