Hello IT-Admin,
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.
I’m sorry to hear that you’ve been running into this error. If you’d like to provide us with example contacts who have run into this error when being added to your account, we would be happy to investigate and confirm the reason for the error. You can reach out to us directly with this information at webservices@constantcontact.com.
I would also mention that our engineering teams are currently working to improve the overall experience with our compliance system check when adding contacts.
Please let us know if you have any other questions!
Regards,
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