If you wish to change your mobile device or authenticator app used for 2FA, you may do so by following these steps:
Step 1: Go to the drop down top right hand corner which contains your name, and click on “My Account”
Step 2: Click on “Security Settings” tab and “Change Settings” button
Step 3: Opens 2FA set up in a new tab. Click on the Delete Icon.
Step 4: Set up using your new device or authenticator app.