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You are here TCD Computer Account > Two Step Sign-In

Two Step Sign-In

Two Step Sign-In (TSSI) is required for all staff and students who wish to access services such as Office 365, MyZone, and the VPN (staff only) when not on the campus network.

TSSI provides added security to your account, ensuring that it cannot be used without your knowledge.

With TSSI, you will be prompted to confirm your identity by a separate method - typically through a code provided by text message to your mobile phone.

Without access to your physical mobile device, remote attackers can’t pretend to be you to gain unauthorised access to your account.

You will receive a TSSI prompt when logging on to the following services from off campus:

  • Office 365
  • VPN (staff only)
  • Core Portal
  • Trinity Web Systems
  • MyZone
  • SITS my.tcd.ie (staff only)

Setting up Two Step Sign-In

For personal accounts

Setup for personal accounts

TSSI is setup during your first sign in to Office 365 (office.tcd.ie)

  1. Sign in, using your Trinity username (username@tcd.ie) and computer login password
  2. You will see the prompt below, click on Next, to begin the setup.



  3. On the next screen you need to select the method to verify your sign-in from now on. Choose Phone from the first dropdown.
  4. Select your country code from the dropdown (typically Ireland 353+, unless your phone package is from another country) and enter your mobile number.
  5. Select a method, either Send me a code by text message or Call me. We recommend the Send me a code by text message option.
  6. Click on Next



  7. You will now receive a text message from Microsoft to your mobile number provided above.



  8. Enter the code into the additional security verification window as below, and click Verify



  9. When the code is verified, on the next screen click Done. You have now completed the setup.

For non-personal accounts

Setup for 'existing' non-personal accounts

You will need your computer and your mobile device to complete these steps.

  1. The recommended authentication method for multiple users is to use the free Microsoft Authenticator app. On your mobile device download the Microsoft Authenticator app (Android | iOS)
  2. On your computer browse to office.tcd.ie and sign in using your non-personal account username (username@tcd.ie) and computer login password.
  3. Once you are logged in, click on your profile icon at the top right (usually your initials or the initials of the account). Then choose View account.



  4. From the left panel, choose Security info. Then click the + Add method button.



  5. From the Which method would you like to add?, choose Authenticator app and click Add.



  6. You will then see the below screen. If you did step 1, it means you have already installed the app on your mobile device. If so click, Next



  7. Click Next to proceed.



  8. When the Scan the QR code screen appears, open the Microsoft Authenticator app on your mobile device and follow steps 'a' to 'd' below



    1. Add an account and choose Work or school account
      Please note: If you already use the Microsoft Authenticator app for another account, just tap the + in the top right corner in the app and choose Work or school account



    2. Select Scan a QR code. (Please note: iPhone users may have to enable the camera in Settings in order to scan the code.)


    3. If you can't use your phone camera, you can manually enter the 9-digit code and the URL. You can view these by clicking on the Can’t Scan Image? button below the QR code.

    4. You will be shown a six-digit code and your account is added.

  9. Switch back to your computer and click Next.



  10. The system will send a notification to your device.



  11. Click Approve on the app as the second step of verification.



  12. When the Notification Approved message appears, click Next.



  13. You are now set up and secure.

Setup for 'new' non-personal accounts

  1. Download the Microsoft Authenticator app (Android | iOS)
  2. Browse to office.tcd.ie and sign in, using your Trinity username (username@tcd.ie) and computer login password. After you choose Sign in, you will be prompted for more information.



  3. Choose Next. The recommended authentication method for multiple users is to use the free Microsoft Authenticator app. If you have it installed on your mobile device, select Next and follow the prompts to add this account.



  4. Click Next to proceed.



  5. When the Scan the QR code screen appears, open the Microsoft Authenticator app on your mobile device and follow steps 'a' to 'd' below



    1. Add an account and choose Work or school account
      Please note: If you already use the Microsoft Authenticator app for another account, just tap the + in the top right corner in the app and choose Work or school account



    2. Select Scan a QR code. (Please note: iPhone users may have to enable the camera in Settings in order to scan the code.)



    3. If you can't use your phone camera, you can manually enter the 9-digit code and the URL. You can view these by clicking on the Can’t Scan Image? button below the QR code.
    4. You will be shown a six-digit code and your account is added.



  6. Switch back to your computer and click Next.



  7. The system will send a notification to your device.



  8. Click Approve on the app as the second step of verification.



  9. When the Notification Approved message appears, click Next.



  10. You are now set up and secure.

Adding new users/devices to non-personal accounts

The new user and the user who originally setup TSSI on the account will need to complete these steps together. The new user will need their mobile device.

  1. On your compuer browse to office.tcd.ie and sign in using your non-personal username (username@tcd.ie) and computer login password.

  2. Once you are logged in, click on your profile icon at the top right (usually your initials or the initials of the account). Then choose View account.



  3. From the left panel, choose Security info. Then click the + Add method button.



  4. From the Which method would you like to add?, choose Authenticator app and click Add.



  5. Your new user should now download and install the free Microsoft Authenticator app on their mobile device (Android | iOS). Once this is done, select Next



  6. Click Next to proceed.



  7. When the Scan the QR code screen appears, open the Microsoft Authenticator app on your mobile device and follow steps 'a' to 'd' to add your account and scan the QR code



    1. Add an account and choose Work or school account
      Please note: If you already use the Microsoft Authenticator app for another account, just tap the + in the top right corner in the app and choose Work or school account.



    2. Select Scan a QR code. (Please note: iPhone users may have to enable the camera in Settings in order to scan the code.)



    3. If you can't use your phone camera, you can manually enter the 9-digit code and the URL. You can view these by clicking on the Can’t Scan Image? button below the QR code.
    4. You will be shown a six-digit code and your account is added.



  8. Once a new device has been added, on your computer a new entry will appear with their device name.



  9. The final step is to change the Default sign-in method to Authenticator app or hardware token – code. This will allow you to use the code from your authenticator app instead of the pop-up notification, the preferred option for multiple users.




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