Please would like to know the solution for this.
We could not be able to connect to constant contact from wordpress 4.8.1. This is ending in an error.
Please find below a screenshot.
Thank you for reaching out to the API Support team here at Constant Contact. I'm sorry you're having trouble connecting your account. I have forwarded your information to our Tier 2 Support team to reach out to you to assist with this issue. You should hear from them soon.
Also, feel free to also reach out to our main support team by phone at 866-289-2101.
API Support Engineer
Our Tier 2 department sent an email to the main email address listed on the Constant Contact account. I do not want to list that address here for privacy reasons. The email was sent on 8/24/17 and I will resend it today as well.