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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 Fix Outlook Not Opening After Windows Update 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 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 clear Outlook credentials manager browsers. Troubleshooting Office 365 sign-in or activation issues can be straightforward if you approach the problem methodically.
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
- 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 cached credentials on your device or a corrupted Office profile can lead to repeated sign-in prompts or activation failures.
- 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.
Follow this guide to ensure a smooth and error-free Microsoft 365 login experience. Additionally, check out the above-listed security best practices and keep your team members aware of common troubleshooting tips. Troubleshooting Microsoft 365 login issues often requires a methodical approach, starting with basic checks and escalating to more complex troubleshooting if needed. Remember, proactive management and regular reviews of your IT infrastructure can prevent many common issues, keeping your business operations running smoothly. Make sure your phone’s operating system is supported by Microsoft 365.
Microsoft 365 Troubleshooting – Quick Fixes for Common Problems

Use the Microsoft 365 activation troubleshooter to resolve Microsoft 365 subscription activation issues. Slow performance solve Office 365 mailbox sync delays can be due to heavy CPU usage or low available memory. Close unused tabs, background processes, or applications to free up system resources.