It used to be, a long time ago, that you had to register for the Red Hat Network to get updates for Red Hat distros. Registration was free, but a survey had to be done once every few months to keep the account alive. They changed all that around Red Hat 9 (the last version of red hat I would ever touch). Even those of us who had paid ($60 per year) RHN accounts lost our accounts, as the distro formerly known as Red Hat Linux went completely commercial, and Fedora Core was born.
I don't know how the RHN works with the profession desktop version, but it sounds like you need to register it. If you paid for it I can't imagine RH charging you for the support account for it. You may need to call them, but I would head to their website and see if there is a place to register that version.
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