How to Troubleshoot Common Microsoft 365 Problems and Issues

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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

For managed environments, we use Intune or Group Policy to force sign-in credential sync and clear old tokens. 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. This means that the authentication setup for your sync is no longer valid.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. You will need to have the correct privileges set on your Azure account in order to set up the M365 sync.

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





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 Outlook repair tutorial to Microsoft Entra Connect, see the upgrade instructions.

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





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. 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. 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.

Reviewing Device Sign-In Settings



Troubleshoot Office 365 Sync and Login Issues

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 how to fix Outlook not opening today attachment, you can run a test sync to obtain this data.

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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 outlook stuck on synchronizing folders 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.



  • Windows, Outlook, and mobile apps often save passwords so users don’t have to keep typing them.
  • The Users Loaded count will be 0 if all users fail to meet the system's requirements for user records.
  • We focus on restoring sync between Microsoft Entra ID (Azure AD), on-premises Active Directory, and user devices so everyone gets back in without headaches.
  • Keeping things updated helps avoid compatibility issues between on-premises Active Directory and Microsoft 365.
  • 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.
  • These figures will give you an impression of how far over the limit the account is.
  • Sometimes a missing or outdated connector blocks the link between Microsoft Entra ID and your local domain controller.
  • You end up with mismatched passwords between the cloud and your local network.


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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