Install the Thomson Reuters Authenticator or another TOTP-compliant authenticator app on the new MFA device that you intend to pair with your account.
Log in to Client Centre.
Click your profile and then click Edit Profile.
On the Profile panel, choose the Multi-factor Authentication tab. Your paired MFA devices are listed here.
Click the Add option link and enter your password.
Follow the prompts to pair your additional device with your account.