Hi everyone,
Thank you for your patience as we looked into this! The good news is we have received word from our engineers that this issue has been resolved. If it is still occurring or if you have any additional questions on this, please don’t hesitate to respond to this post as we would be happy to assist you further.
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Hello,
In order to avoid that message, you would need to migrate your integration to the v3 API, as the v2 API does not have the ability to create email campaigns in the new Custom Code Editor.
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Thank you for confirming that moving to the v3 API is a way forward. Unfortunately, you've put us in the position of having to do a significant amount of work to stay with Constant Contact.
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