Use the Microsoft 365 network connectivity test to measure connectivity between your device and the internet, and from there to Microsoft’s network. Use the MIcrosoft 365 inventory scan troubleshooter to generate either a normal modern authentication troubleshooting or full scan report of your computer and installed Microsoft 365 applications. Use the Microsoft 365 sign-in troubleshooter to help resolve sign-in issues encountered with Microsoft 365. If you can't sign into your Microsoft account, most issues can be identified by our sign-in helper tool.

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 FixTechGuide support for Office 365 to repeated sign-in prompts or activation failures.

Recover your account

Use the uninstall troubleshooter to uninstall Microsoft 365, Office 2021, Office 2019, or Office 2016 from your Windows PC. Find solutions to common problems or get help from a support agent.

3 Step 3: Verify Network Connectivity and Firewall Settings

• If freezing persists, reinstall the app using files downloaded from your account dashboard to rule out bugs.
• If you can't sign into your Microsoft account, most issues can be identified by our sign-in helper tool.
• If you’re still stuck, reboot your computer and try the installation again, preferably during off-peak internet hours.
• Below is a structured approach to diagnosing and resolving Office 365 sign-in or activation errors.
• If we don't detect any problem, we'll guide you through how you can help yourself.
• If these connections are disrupted, sign-in and activation will fail.
• Regularly cleaning up your hard drive or upgrading hardware like RAM can also enhance performance.
• Run the Activation Troubleshooter, accessible online or via your app settings.

For manual uninstallation, delete leftover Office files in Program Files or Library folders, and clear Microsoft credentials from your system to ensure a clean reinstall if required. If your account is compromised or hacked, use Microsoft’s sign-in helper to recover your account and reset your security settings. If you are unable to do this and have exhausted all the other fixes, then contact Microsoft Support for professional account recovery. Microsoft 365 is a vital tool for many businesses, and login issues can significantly disrupt day-to-day operations. In this guide, we will take an in-depth look at troubleshooting and resolving common Microsoft 365 login problems so you can keep your business running smoothly. If you’re confident your credentials are correct and the sign-in still fails, proceed to the next step for deeper inspection of license status and subscription details.

Microsoft 365 Troubleshooting – Quick Fixes for Common Problems

Simply open the Office app normally, and all your files are saved locally until internet access resumes. For cloud-based services like Outlook or OneDrive, offline access won’t work until you sync online again. Make sure to save any updates for immediate syncing FixTechGuide support for Office 365 once a connection is re-established.