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I've asked our support team to contact you directly to provide assistance.
Let me know how things work out for you.
I believe this is going to be a firewall or proxy issue, same as what's described in this technote:
"Error: "Adobe DRM Error" when you activate Digital Editions or access an eBook"
What's happening is that the book authorization can not get the voucher from the HTTP header ( sent in response from Adobe Content Server during the voucher fulfillment for your book).
A firewall or proxy server or something else on your machine has mangled or stripped the custom HTTP headers. It happens a lot..
What's the procedure to take to solve the problem? I got the same error.
Your promt help is greatly appreciated!