Hello user650611,
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 looks like the failed authorization attempts are using a different redirect URI than the ones that you have saved within your key's settings. Try changing "pdx1" in your redirect URI to "utah".
If the issue persists, please feel free to reach our team directly/securely via email at webservices@constantcontact.com referencing case #32950598.
Please have a look and let us know if you have any other questions!
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