How to Troubleshoot Common Microsoft 365 Problems and Issues

We also scan Event Viewer logs under Applications and Services Logs → Directory Synchronization for Event IDs like 650–657 (for sync activity).



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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We tell users to sign out completely and remove stored credentials from Windows Credential Manager or their device’s keychain. Sometimes, rejoining the device to Azure AD or just reauthenticating in Office apps does the trick. This pops up a lot after admins reset a password in the Microsoft 365 admin center. That changes the password in Microsoft Entra ID, but not right away in your local Active Directory. You end up with mismatched passwords between the cloud and your local network. The Users Loaded count will be 0 if all users fail to meet the system's requirements for user records.

What to do when Office 365 password reset doesn’t sync across devices



Troubleshoot Office 365 Sync and Login Issues

On Windows, open Credential Manager, pick Windows Credentials, and remove anything related to Office 365 or Microsoft 365. On macOS or iOS, delete stored credentials from Keychain Access. To update from Azure AD Sync FixTechGuide Windows update Outlook fix to Microsoft Entra Connect, see the upgrade instructions.

Login & Sync Errors: Personal & Business Microsoft 365 Accounts on Same Device



Troubleshoot Office 365 Sync and Login Issues

Start by disconnecting the device from Work or School Account settings, then reconnect with the user’s updated password. Cached credentials on Windows or mobile devices can block the update. We tell users to sign out and sign back in with the new password. Running the Azure AD Connect Health tool gives you alerts for sync errors and interruptions. Keeping Azure AD Connect up to date and testing sync regularly helps password resets flow like they’re supposed to.

Reviewing Device Sign-In Settings



Troubleshoot Office 365 Sync and Login Issues

The Users Processed count will be 0 is there are no users in the synced dataset after filtering. 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 online Outlook email repair utility account increased. Users I create within the Office 365 portal are fine, so I assume it is something to do with Azure AD Connect. We have reset the router, checked internet speeds, signed in and out of M365 apps, reinstalled apps and checked for Windows updates.

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Microsoft 365 is a robust platform, but when problems arise, fast resolution is key to productivity. From sync errors to sign-in challenges and reset cached Exchange mode collaboration setbacks, these common Office 365 troubleshooting techniques can restore service quickly. 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. The most common reason for missing users is that you've run a Test Sync, instead of a Manual Sync. If that doesn't resolve your missing users issue, please follow our guide to troubleshooting missing users below.

Common Causes of Office 365 Password Reset Sync Issues



  • The sync does not delete users but rather sets them to inactive.
  • If it didn’t, a few targeted checks usually restore access—no need to keep resetting your password over and over.
  • Our relationship to the Microsoft Partner Network allows us to provide competitive pricing and authentic software and support, all with a much-needed human element.
  • On macOS or iOS, delete stored credentials from Keychain Access.
  • You will need to have the correct privileges set on your Azure account in order to set up the M365 sync.
  • Checking the sync logs helps confirm password changes are making it everywhere they should.
  • This can happen for the a number reasons particularly if your sync authenticates using Delegated Permissions.
  • Bad settings in Azure AD Connect cause lots of password sync failures.


TrustedTech delivers unbeatable customer service, with experts in licensing and high-level technicians always on-call to answer your tech issues in-depth. 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. The error message in the Summary sheet of the Sync Summary spreadsheet attachment can also highlight the reason for this. Both of our authentication methods can fail if the Enterprise Applications entry for the sync in Azure AD is deleted or if it has had its permissions modified. I didn't try logging in originally, I just assumed they'd work, and so tried migrating mailboxes.

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