Thanks for getting back.
Figured that would be the case, so opted to use Mailchimp form code and embed directly.
For reference to anyone looking for this issue…
My next go-to solution would have been to create a blank template, use it as a post set it as homepage with custom code, use Mailchimp for WP shortcode there, and edit the .htcaccess to redirect traffic from all pages to this custom one.
