Polycom CX500 Lync Phone Edition consistently failing to sign in

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http://serverfault.com – I have configured a Lync system which is successfully working with the Lync windows client. I followed the instructions at http://blog.schertz.name/2010/12/configuring-lync-server-for-phone-editi... and was able to successfully configure DHCP and DNS. I tested with: DHCPUtil -EmulateClient and Test-CsPhoneBootstrap Which both returned successfully. However, when entering the same details which worked on Test-CsPhoneBootstrap on a Polycom CX500, I get the error: "An account matching this phone number cannot be found. Please contact your support team." There is als (HowTos)