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Enable permissions for file access and notifications within app settings. For syncing or email issues, verify your mobile connection or switch between WiFi and cellular data. Reinstall the app if problems persist using Microsoft’s compatibility guide to Office 365 sign-in errors manuals. Larger files may cause a temporary slowdown, so ensure your device has adequate memory.  
  
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 FixTechGuide Office 365 troubleshooting 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 Sometimes, an expired license or outdated credentials are the culprit.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  
  
  
  
Office 365 uses several internet endpoints and cloud services to authenticate users and validate licenses. If these connections are disrupted, sign-in and activation will fail. Use the Excel check troubleshooter to resolve Excel for Windows startup, hang, or crash issues. Get Help has troubleshooters for Microsoft 365 you can run for many common scenarios. These often help resolve issues without the need to contact support. If a troubleshooter is available for your issue, select Start to run that troubleshooter.  
  
3 Step 3: Verify Network Connectivity and Firewall Settings  
  
If you or your employees can’t sign in to Office 365, or if the applications repeatedly prompt for activation, productivity can grind to a halt.Confirm your subscription status and sign in with the correct Microsoft account.If your account is locked due to multiple unsuccessful login attempts, wait for the lockout period to end.In many cases, performing simple checks—like verifying correct usernames and valid licensing—will resolve the issue quickly.  
  
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. Make sure to update them to the latest version and try again to fix Microsoft 365 login issues. If you are still unsure about the right password and are facing Microsoft 365 login issues, use the Forgot Password option to reset your password.  
  
Microsoft 365 Troubleshooting – Quick Fixes for Common Problems  
  
  
  
If you encounter this error – Sorry, we are having temporary server issues, then chances are that the issue lies at Microsoft’s end. Alternatively, you can use the browser’s incognito mode or private mode to check if the issue persists. If you would like to ask me another question in the future, you can add me as a favorite Expert. 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. You'll have the option to do that on your "My Outlook OST vs PST repair Questions" page if you choose to rate our interaction or you can request me by name if you wish.