How to Enable Multi-Factor Authentication for AWS Services …

Enable Multi-Factor Authentication: Select this check box to enable MFA configuration input settings fields. RADIUS server IP address(es): Enter the IP addresses of your RADIUS/MFA server. You can enter multiple IP addresses, if you have more than one RADIUS/MFA server, by separating them with a comma (for example, 192.0.0.0 , 192.0.0.12 ).

https://aws.amazon.com/blogs/security/how-to-enable-multi-factor-authentication-for-amazon-workspaces-and-amazon-quicksight-by-using-microsoft-ad-and-on-premises-credentials/