If one of these resolves your problem, close the app and continue working. Use the Microsoft 365 shared computer activation (SCA) troubleshooter to enable shared computer activation for Microsoft 365 applications. If your account is locked due to multiple unsuccessful login attempts, wait for the lockout period to end.

Common Causes of Office 365 Sign-In and Activation Issues

Use the Microsoft 365 activation troubleshooter to resolve Microsoft 365 subscription activation issues. Slow performance can be due to heavy CPU usage or low available memory. Close unused tabs, background processes, or applications to free up system resources. Additionally, ensure you’ve installed all available updates, as performance improvements are often included in patches.

I can't sign in to my Microsoft account

In this comprehensive guide—KB113—we’ll explore the most common causes of Office 365 sign-in and activation issues. We’ll then walk you through a practical, step-by-step troubleshooting methodology. Combine these best practices with ongoing training and proactive license management, and you’ll be well on your way to a stable, secure Office 365 environment. Sometimes, an expired license or outdated credentials are the culprit. Other times, it might be network problems, conflicting versions of Office, or organizational security policies that block the authentication process.

What should I do if updates for Microsoft 365 apps fail to install?

Clearing cached credentials, running a repair, or using the Microsoft Support and Recovery Assistant (SaRA) can also address common local device issues. Verify that you’re logged into the correct Microsoft account both in OneDrive and Office apps. If syncing is paused, resume it from the OneDrive system tray icon.

Frequently asked questions

If you can't sign into your Microsoft account, most issues can be identified by our sign-in helper tool. If you encounter this error – Sorry, we are having temporary server issues, then chances are that the issue lies at Microsoft’s end. Alternatively, you can use the browser’s incognito mode or private mode to check if the issue persists. If you would like to ask me another question in the future, you can add me as a favorite Expert. You'll have the option to do that on your \"My Questions\" page if you choose to rate our interaction or you can request me by name if you wish. You'll inbox repair tool alternative have the option to do that on your "My Questions" page if you choose to rate our interaction or you can request me by name if you wish.

• Sometimes cached credentials on your device or a corrupted Office profile can lead to repeated sign-in prompts or activation failures.
• If you are unable to do this and have exhausted all the other fixes, then contact Microsoft Support for professional account recovery.
• Check if your system meets the Microsoft 365 installation prerequisites.
• If your account is locked due to multiple unsuccessful login attempts, wait for the lockout period to end.
• Remember, if all else fails, reaching out to Microsoft Support directly or using their official support documentation can provide tailored assistance for complex organizational setups.

If a troubleshooter is available for your issue, select Start to run that troubleshooter. You might find it simple, but the most fix MFA prompts not working common cause of login failure is entering the wrong username and password combinations. Below is a structured approach to diagnosing and resolving Office 365 sign-in or activation errors.

Step-by-Step Troubleshooting for Microsoft Office 365 Login Issues

Find solutions to common problems or get help from a support agent.





If you’re unable to sign in to your Microsoft 365 account, ensure you’re using the correct email and password. Locked accounts, due to multiple failed attempts, may require waiting or following unlock instructions. Check your internet connection, as weak connectivity can cause issues. For work or school accounts, confirm with your organization that your account is active.

Enable permissions for file access and notifications within app settings. For syncing connection status shows disconnected or email issues, verify your mobile connection or switch between WiFi and cellular data. Reinstall the app if problems persist using Microsoft’s compatibility manuals. Larger files may cause a temporary slowdown, so ensure your device has adequate memory.