As Sprintax has provided the option to e-sign the W8BEN form, a Two-factor Authentication is required. Its purpose is to provide additional security measure to protect your personal information.
Once it’s set up through your account with an authenticator app of your choice (Google or Microsoft Authenticator), your account will require the 6-digits code for every log in. Please check your app which has been set up with your Sprintax Calculus account and use the generated 6-digits code to log in to your account.