I believe this is what you are looking for … but not sure:
https://sendfox.com/iforumrx
Let me know if you need anything else. Thanks for your help!!
I’m having a similar issue. SendFox API indicates that there is an active connection between my WP site and SendFox. The Registration Form is “Active” but none of the new members are being sent over to SendFox. I’m using a member management plugin called Ultimate Member (v 2.1.9) – so suspect the issues are similar to this previous inquiry.
https://wordpress.org/plugins/ultimate-member/