Sendgrid integration doesn’t work

I’m using Sendgrid for my email marketing. I have created an embedded form for Book Demo and Get a Call, the CTA buttons.
This works just fine. The email gets stored within Hustle.

But the integration I’ve made to my Sendgrid doesn’t work. There isn’t a lot of settings either, it’s just connect or disconnect. So how do I even make sure it get’s into the correct list?

The page I need help with: [log in to see the link]