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I'm sorry for the trouble caused to you.
Are you sure that you have used the correct "App Name" and the "API key"? I will suggest you to please ensure the API is correct and then try to integrate your form again with infusionsoft. The following guide should help you: http://ug.infusionsoft.com/article/AA-00442/0/How-do-I-enable-the-Infusionsoft-API-and-generate-an-API-Key.html#
Do get back to us if the issue persists ad we will report it to our back end team.