reCaptcha on LearnPress registration form

As stated on https://www.ads-software.com/plugins/wp-simple-firewall/#developers (under section 6.10 – Series Released: 15th October, 2018) support for LearnPress login/registration forms has been added.
I can get the reCaptcha working for the login form but not for the registration form. What steps are necessary in order to take to get this feature working?