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 Fix Outlook Not Opening After Windows Update 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 signinto 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 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. Browser or app issues, like outdated software or cached data, can also interfere; try clearing your cache or switching FixTechGuide Outlook repair tutorial browsers. Troubleshooting Office 365 sign-in or activation issues can be straightforward if you approach the problem methodically.

Recover your account

If the issue persists, Microsoft has created a dedicated tool called Microsoft Support and Recovery Assistant (SaRA) to automate many troubleshooting tasks. The tool will ask you to enter the email address or mobile phone number you're trying to sign in with and check the detailsyou provide. If we detect a problem with your account, we'll tell you what you need to do to solve the problem.

3 Step 3: Verify Network Connectivity and Firewall Settings

• For codes linked to storage limitations, free up disk space or install on an external drive.
• Double-check your internet connection, as OneDrive requires an active network to sync files properly.
• Use the Microsoft 365 shared computer activation (SCA) troubleshooter to enable shared computer activation for Microsoft 365 applications.
• The "Unlicensed Product" error usually indicates an inactive or unlinked subscription.
• 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.
• And if your environment is particularly security-conscious, keep in mind that policy-based blocks on specific devices or geographic regions can also interfere with Office activation.
• If you would like to ask me another question in the future, you can add me as a favorite Expert.
• Keep cache sizes clear and refer to official Microsoft troubleshooting manuals for persistent app freezes.
• 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.

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

Use the Microsoft 365 activation troubleshooter to resolve Microsoft 365 subscription activation issues. Slow performance work offline mode stuck can be due to heavy CPU usage or low available memory. Close unused tabs, background processes, or applications to free up system resources.