Why do I get the error "Registration Token unable to entitle system maximum membership exceeded" when I try to register a machine on my Red Hat Network (RHN) account?

Updated -

Symptoms:

There are unused subscriptions in the Red Hat Network (RHN) account but when issuing the command "rhn_register" or "update --register", it gives the error:

Error Class
Code: 91. Error Class Info: Registration token unable to entitle system;
maximum membership exceeded"
<...>

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