2. Click the "Email or phone" and enter your GTC email address.

3. On the "More information required" screen, click next.

4. Download the Microsoft Authenticator app on your mobile device, then click 'Next' to proceed.

5. To set up your account, hit next.

6. In the Authenticator app on your phone, tap the '+' icon in the top right corner, select 'Work or School account,' and choose 'Scan a QR code.'
Then, return to your computer and click 'Next' to continue.

7. You will get a two-digit code on your computer; enter the code on your phone and hit next.

8. Enter your phone number for two-factor authentication using only the area code and 7-digit number.

9. Microsoft will call your phone. You will be prompted to answer a question and press the pound (#) key to verify.

10. After registering your phone, click next.

11. Congratulations, you are now MFA authenticated.