Insert Hustle as widget does not work

Hi there

i am having a hard time setting up hustle as a widget. since i switched to campaign monitor (mailchimp was somehow implemented in enfold, but i prefer CM), i need the widget version for the footer section. The problem: in the widget settings, i can insert a hustler module, but i cannot chose one of the optins.
Your kind assistance is highly appreciated, so thank you in advance.

Have a great day, cheers,
Sebastian.