rhn_register fails with Error Class Code 70 for "Red Hat Enterprise Linux Server (v. 6) Extended Update Support" entitlements

Issue

• attempting to register a new server with rhn_register fails with error code 70:

Error Message:
   Insufficient Software Channel Entitlements:

   cfid9170  Red Hat Enterprise Linux Server (v. 6) Extended Update Support

note: One of the above Software Channel Entitlement(s) are required
to provide access to: cid17799 RHEL EUS Server (v. 6.4.z for 64-bit x86_64)
Error Class Code: 70
Error Class Info:
   All available subscriptions for the requested channel have been exhausted.