MailChimp campaign not in Squarespace form list

My goal is to use MailChimp to send an automated email reply when viewers enter their email address into a Squarespace form block. The list dropdown in the Squarespace forms does not contain the campaigns I have created in MailChimp. The accounts have been integrated together. 

Is there a different way I need to set up the campaign in MailChimp so that when I go into the Squarespace form storage list, the campaigns will appear? 

Thank you.