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

Andrea Rex 2026-01-14 17:17:04 +00:00
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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 Windows, open Credential Manager, pick Windows Credentials, and remove anything related to Office 365 or Microsoft 365. For managed environments, we use Intune or Group Policy to force sign-in credential sync and clear old tokens.
You'll also receive a mail (to the alternate email and to your admin email) from Microsoft 365 that indicates your tenant has encountered directory synchronization errors.Here’s a step-by-step approach to help you spot the issue, fix it, and avoid these sync delays down the road.We keep password synchronization reliable by staying proactive and making sure users know how their actions affect access across Microsoft 365 and their devices.This software allows users to process numerous OST files at once without any size limitations.Windows, Outlook, and mobile apps often save passwords so users don’t have to keep typing them.When they go back to the message and press send they get an error that the message has been deleted.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.Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not.
Troubleshooting Microsoft 365 sync issues
At NetTech Consultants, we help organizations keep Microsoft 365 running smoothly and securely. The Users Loaded count will be 0 if all users fail to meet the system's requirements for user records. The Users Processed count will be 0 is there are no users in the synced dataset after filtering.
Common Reasons Behind Outlook Sync Issues
I would greatly appreciate [credential loop in Microsoft 365](https://ashok.websitedemourl.com/read-blog/13529_outlook-sync-errors-with-office-365-software-amp-applications.html) it if you could let me know if your issue has been resolved. 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.
Address
Our training has quick guides about what happens after you update your password. For example, you might get signed out or have to reauthenticate on your phone. 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.
Get Expert Help from TrustedTech
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. In these cases, direct escalation to Microsoft or working with a Microsoft CSP partner, such as TrustedTech, can expedite resolution and minimize downtime. Our licensing engineers can help triage complex problems and ensure you're on the right support path. Microsoft offers several built-in tools to help identify and resolve persistent issues. A vast community of Microsoft Office365 users that are working together to support the product and others. TrustedTech is dedicated to being a reliable resource for all software and technology support needs.
What should I do if my sync failed due to authentication issues?
We also scan Event Viewer logs under Applications and Services [FixTechGuide Office 365 troubleshooting](https://lawrencewilbert.com/read-blog/26172_fix-your-outlook-email-connection-by-repairing-your-profile.html) 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. The error message in the Summary sheet of the Sync Summary spreadsheet attachment can also highlight the reason for this.
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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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. We look at audit logs in the Microsoft 365 admin center to see when and where the password changed. That tells us if the new credentials made it to the cloud directory. We tell users to sign out completely and remove stored credentials from Windows Credential Manager or their device’s keychain.
We check that the Work or School Account in Windows Settings is active and linked to the right domain. 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 [how to fix Outlook not opening today](https://demo.safecircle.family/read-blog/25420_the-send-receive-function-in-outlook-365-is-taking-too-long-microsoft-q-amp-a.html) AD since the M365 sync was configured on your account.