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Mailchimp post request link not working

Hey guys,
I’m currently having some problems integrating mailchimp with webflow, I’ve followed everything in the guide however I’ve now ran the post request link through postman and the link isnt working at all. Has anyone else had any similar problems ?. Embedding the mailchimp form is working for my site but I don’t have the coding experience to customize the form to make it look good on my website.