Hello DanielleF2369,
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.
The error "Error getting campaign activity by activityId __: undefined" being received within the website UI is not related to Constant Contact's API.
I apologize for any inconvenience that this error has caused, and have opened up a case with one of Constant Contact's Tier 2 customer support specialists so that they can follow up with you directly to verify whether you are still experiencing issues related to this error.
One of our Tier 2 support specialists should be in touch within 4 business days. Otherwise, for immediate assistance, or if you’d like a callback/email from them at a certain day/time you can call our support line at 866-289-2101 and reference case # 32012755.
Please have a look and let us know if you have any other questions!
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