Hello Janehelm1014,   Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.   It sounds like the form was set up and connected successfully if you are able to view the lists. Please feel free to email us some examples of addresses that were used in the form but not added and we'd be happy to look into them for you to see what might be causing the issue.   You can reach our team directly/securely via email at webservices@constantcontact.com   Please have a look and let us know if you have any other questions! ... View more