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I have a form and server-side PHP code based on the PHP sample from ConstantContact. It returns a 400 error when I try to add a contact. If I use an email address I know is already in my contacts, I correctly get an "email address already exists" error, so that indicates there is no issue with login, authentication. But I can't figure out why the operation is failing for new contacts. Below is the XML that I'm sending. Any ideas?