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You are here Trinity Computer Account > Change your computer account password > Microsoft 365 - Self-service password reset tool

Microsoft 365 - Self-service password reset tool

The Microsoft 365 self-service password reset tool allows you to:

  • Change your password if you know it
  • Reset your password if you have forgotten it
  • Unlock your account

This tool is available to both staff and students via office.tcd.ie.

Change your password if you know it

  1. Browse to office.tcd.ie and sign in
  2. Once you have signed in, click on the Settings icon on the top right
  3. Click on the Change your password link



  4. Enter your old password, create a new password, confirm it and click Submit to change your password



Visit Microsoft's website for further information on how to change your password with Microsoft 365.

Reset your password if you have forgotten it

  1. Browse to office.tcd.ie and sign in
  2. Once you reach the 'Enter password' screen, click on the Forgotten my password link

    Sign in window

  3. Enter your email address, then enter the text for the Captcha underneath. Click Next

    My account window

  4. Choose I've forgotten my password and Next



  5. Complete the requested verification steps and click Next


    • The verification step options will usually be; a code via text message; a phone call; or a code via the Microsoft Authenticator app


  6. Once you have completed the verification steps, enter the new password twice and click Finish




  7. Your password will then have been reset



  8. You will also get an email confirmation of your password change



  9. You should restart your PC, or else lock it and unlock it with your new password to update your credentials on your computer

Unlock your account

If your account is locked out, you can use the Microsoft 365 Self Service Password Reset tool to unlock your account.

  1. Browse to passwordreset.microsoftonline.com
  2. Enter your email address, then enter the text for the Captcha underneath. Click Next

    My account window

  3. Select I know my password, but still can't sign in and click Next



  4. Complete the requested verification steps and click Next


    • The verification step options will usually be; a code via text message; a phone call; or a code via the Microsoft Authenticator app


  5. Once you have completed the verification steps successfully, your account will be unlocked


Password strength

What are the requirements for my password to be strong enough?

To ensure your password is secure it must follow the below regulations:

  • be at least 8 characters long
  • have a mix of upper and lowercase characters
  • include at least one numeric character OR a special character such as ! @ $ % * _ - + = ~
  • not include £ € : ? | space
  • not include part of your first name, last name or username
  • not be the same as any of your previous 24 passwords

Good to know: your password can only be changed once in any 24 hour period