Double-check your internet connection, as OneDrive requires an active network to sync files properly. For a larger cache of files, clear up local FixTechGuide Outlook repair tutorial storage to ensure uninterrupted access. Open apps in Safe Mode to bypass add-ins and check for improvements. Perform a quick repair via "Programs and Features" to optimize performance.

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

Additionally, ensure you’ve installed all available updates, as performance improvements are often included in patches. Regularly cleaning up your hard drive or upgrading hardware like RAM can also enhance performance. If you’ve tried all these steps and still can’t resolve the sign-in or activation errors, you may need more advanced troubleshooting. Completing the above steps resolves a large majority of Outlook OST vs PST repair typical sign-in and activation problems.

Recover your account

You can feel free to contact our experts, as they are available 24X7 for solving your issues. If your subscription has expired, your account is disabled, or your IT admin has blocked your account, in all these cases, you would not be able to log in to your account. Use the Microsoft 365 setup troubleshooter to install Microsoft 365, Office 2021, Office 2019, or Office 2016 on your Windows PC.

3 Step 3: Verify Network Connectivity and Firewall Settings

• Microsoft 365 is a vital tool for many businesses, and login issues can significantly disrupt day-to-day operations.
• If you are using an outdated web browser or Office app, it can create compatibility issues, which eventually lead to Microsoft 365 sign-in problems.
• If we detect a problem with your account, we'll tell you what you need to do to solve the problem.
• Close unused tabs, background processes, or applications to free up system resources.
• You have to follow a systematic approach while dealing with Microsoft 365 login issues.
• Locked accounts, due to multiple failed attempts, may require waiting or following unlock instructions.
• Perform a quick repair via "Programs and Features" to optimize performance.

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 reset cached Exchange mode can be due to heavy CPU usage or low available memory. Close unused tabs, background processes, or applications to free up system resources.