Why can’t I sign in to the Office 365 portal using Outlook credentials?

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Why can’t I sign in to the Office 365 portal using Outlook credentials?

Category: Outlook

If you’re unable to sign in to the Office 365 portal, it may be due to incorrect credentials or a mismatch between your Outlook client settings and your Office 365 account configuration.

🧭 Credentials to Use

  • Username: Typically formatted as your Employee ID + domain (e.g., 123456@company.co.jp)
  • Password: The new password you set when signing in to Windows

🔧 Troubleshooting Steps

  1. Check for Caps Lock
    • Ensure Caps Lock is off when entering your password
  2. Verify Username Format
    • Confirm you’re using the correct domain and ID combination
  3. Try Signing In via a Browser
    • Go to https://portal.office.com and test login directly
  4. Contact the System Help Desk
    • If the error persists, your password may need to be reset by your IT administrator
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