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 rebuild Outlook data file quickly 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?

Always verify offline availability settings for critical documents you might need. In this comprehensive guide—KB113—we’ll Microsoft Outlook Email Repair Tool Online 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 Sometimes, an expired license or outdated credentials are the culprit.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.

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

• 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.
• Office 365 uses several internet endpoints and cloud services to authenticate users and validate licenses.
• 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

Understanding these root causes will help you map out a clearer resolution path. In many cases, performing simple checks—like verifying correct usernames and valid licensing—will resolve the issue quickly. After you run any troubleshooter, Get Help provides details on any findings and suggestions for possible remedies. Outlook OST vs PST repair 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.