How to Troubleshoot Common Microsoft 365 Problems and Issues

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We also remind users to refresh their Office sign-in token by signing out of all Microsoft apps and signing back in with the new password.



Office 365 sync problems and login fixes

While M365 is highly stable, it’s not immune to occasional disruptions. We keep password synchronization reliable by staying proactive and making sure users know how their actions affect access across Microsoft 365 and their devices. We start by checking that Azure AD Connect is running and password sync is enabled.

Calendar Sync Issues in Outlook



Here’s a step-by-step approach to help you spot the issue, fix it, and avoid these sync delays down the road. With apps syncing across devices and cloud services, sync issues are among the most frequently reported M365 problems. These can include missing files, ghost icons, or documents that do not update in real-time. Even when sync works, cached passwords on devices can cause login failures. Windows, Outlook, and mobile apps often save passwords so users don’t Troubleshoot Office 365 Sync and Login Issues have to keep typing them. If a password changes, those caches might still use the old one until you clear them out.

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Office 365 sync problems and login fixes

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. 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. We have resources to help you identify potential issues and fix them.

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Office 365 sync problems and login fixes

Microsoft 365 is a robust platform, but when problems arise, fast resolution is key to productivity. From sync Microsoft Outlook Email Repair Tool Online errors to sign-in challenges and collaboration setbacks, these common Office 365 troubleshooting techniques can restore service quickly. 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. Password sync usually fails when credentials don’t update between Microsoft Entra ID (Azure AD) and your on-premises Active Directory.

Microsoft 365 Admin Center Not Responding



  • You also learned simple troubleshooting steps you can try on your own, along with when it makes sense to bring in expert help.
  • You might find someone who faced a similar issue and solved it using a different approach that works better in your situation.
  • With apps syncing across devices and cloud services, sync issues are among the most frequently reported M365 problems.
  • If your problems started after a system or app update, consider rolling back to a previous version or checking for patches that address the issue.
  • Running the Azure AD Connect Health tool gives you alerts for sync errors and interruptions.
  • Technical Specialist with 3+ years of experience in implementing IT infrastructure, AI-driven automation and supporting digital innovation.


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. First, we check that the password reset finished in Microsoft 365 or Microsoft Entra ID. The user should log in to the Office 365 web portal with the new password. If the old password still works, the reset probably hasn’t synced. 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.

Office 365 sync problems and login fixes



The app may have outdated cache files or your system may have pending updates. Select the icon you see on your PC from the list below, and we'll show you the steps to help get you syncing again. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Microsoft offers several built-in tools to help identify and resolve persistent issues.

Support for Office 365 Problems After Update

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