However, if the administrator is unable to resolve issues with the help of self-service support resources, they should Contact support. Technical support for Microsoft 365 operated by 21Vianet subscriptions provides assistance with basic installation, setup, and general technical usage. If you’re a volume licensing admin but are unable to access the admin center, you can create an online support request. With every subscription of Microsoft 365 operated by 21Vianet, 21Vianet support provides technical, presales, billing, and subscription support. Have your Microsoft 365 apps suddenly started crashing after a recent Windows or Office update? Many users experience random application freezes, launch errors, and constant crashes after installing new patches or cumulative updates.

⃣ Reset Browser Cookies & Cache

If your admin enabled Modern Authentication (MFA), try disabling it temporarily via Azure Active Directory → Properties. Alternatively, generate an app-specific password if using Outlook 2016 or older. This resets your authentication cache and forces a fresh token request.

Microsoft 365 Apps Crashing After Update — Step-by-Step Repair Guide

• If login issues are still persisting, our experts can assist you live via WhatsApp.
• When Office 365 search stops working after updates, it’s usually a minor indexing or cache issue — not a major fault.
• Stay tuned on FixTechGuide.com for more troubleshooting guides and expert fixes.
• Then open any Office app → File → Account → Update Options → Update Now to ensure both are synchronized.
• In this guide, we’ll walk you through every step to fix Office 365 login problems on both Windows and the web version.
• The Microsoft 365 Copilot app empowers your employees to do their best work with Copilot in the apps they use daily.
• Outlook and Office 365 sync issues can be frustrating but are almost always fixable.

For iPhone users, reinstalling Outlook or updating to the latest iOS often resolves stuck sign-in loops instantly. Many users have both personal Microsoft accounts (e.g., rebuild Outlook data file quickly Outlook.com) and work/school Office 365 accounts. If both are signed in simultaneously, the system can confuse the authentication path.

? Fix Office 365 Login Issues on Mobile

It automatically diagnoses and repairs mailbox not updating on IMAP many Office 365 problems — including search indexing and sync issues. In this guide, you’ll learn how to fix Office 365 search not working after update using step-by-step methods verified to restore indexing and search functionality. Whether it’s Outlook, Word, or Excel, these fixes ensure your data is re-indexed, searchable, and synced properly. For more self-help resources, see Microsoft 365 operated by 21Vianet. You must be an admin for a business subscription to use these support methods.

Step 2 – Update Outlook and Office 365

This ensures that the system-wide search index service is active and linked to Office 365 apps. Then, navigate to File → Options → Add-ins, and disable all non-Microsoft add-ins. If your country/region isn’t listed, select a neighboring country/region or dial the United States support phone number. For a smoother support experience, we recommend that you open separate support requests for each issue. You must have at least one subscription bought through flush DNS and re-sync Outlook Microsoft to access Microsoft support. The steps to access the repair tool vary depending on your operating system.

Repair Outlook OST File Not Working in Office 365 – Complete Fix (

Microsoft 365 with Microsoft Teams helps deliver a complete, secure solution to help everyone work better, smarter, and more cohesively. Microsoft Create has professionally designed, fully customizable templates to help you get things done. Find solutions to common problems or get help from a support agent.