Now, let’s look at how to fix these issues step by step. Your trusted Microsoft 365 login troubleshooting tech help & troubleshooting hub. If the error occurs during a Windows update, the Windows Troubleshooter can help identify and fix the problem. How do I login to the Office Portal? To sign in to Microsoft 365 or Office on the web:Go to www.microsoft365.com and select Sign In. ​​​​​​​Sign in.Enter your email address and password. This might be your personal Microsoft account, or...