If your account is locked due to multiple unsuccessful login attempts, wait for the lockout period to end. It can vary from 1 to 30 minutes, depending on the number Office 365 sync Problems and login fixes of failed attempts you have performed. Once the waiting period is over, try logging in again with the right credentials. In these scenarios, you’ll need more in-depth knowledge of Office 365 licensing, Azure Active Directory (Azure AD) configurations, or advanced policy settings.

How do I fix the ‘Product Activation Failed’ error in Microsoft 365?

If we don't detect any problem, we'll guide you through how you can help yourself. Being a Microsoft 365 user, if you have encountered an error while logging into your account, you are not alone. 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. With the right planning and knowledge, nearly all sign-in and activation troubles can be resolved quickly and efficiently. Sometimes cached credentials on your device or a corrupted Office profile can lead reset cached Exchange mode to repeated sign-in prompts or activation failures.

Recover your account

Office 365 uses several internet endpoints and cloud services to authenticate users and validate licenses. If these connections are disrupted, sign-in and activation will fail. Use the Excel check troubleshooter to resolve Excel for Windows startup, hang, or crash issues. Get Help has troubleshooters for Microsoft 365 you can run for many common scenarios. These often help resolve issues without the need to contact support. If a troubleshooter is available for your issue, select Start to run that troubleshooter.

3 Step 3: Verify Network Connectivity and Firewall Settings

• Yes, Microsoft 365 works offline for most apps like Word and Excel.
• Use the uninstall troubleshooter to uninstall Microsoft 365, Office 2021, Office 2019, or Office 2016 from your Windows PC.
• If syncing is paused, resume it from the OneDrive system tray icon.
• Open apps in Safe Mode to bypass add-ins and check for improvements.
• In these scenarios, you’ll need more in-depth knowledge of Office 365 licensing, Azure Active Directory (Azure AD) configurations, or advanced policy settings.
• Look up the error code on the official Microsoft site for tailored steps.
• You can feel free to contact our experts, as they are available 24X7 for solving your issues.

You might find it simple, but the most 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. Start with the basics and move toward more advanced methods only if necessary.

Microsoft 365 Troubleshooting – Quick Fixes for Common Problems

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 have the option to do that on your "My FixTechGuide login issue guide Questions" page if you choose to rate our interaction or you can request me by name if you wish.