I had a similiar problem, but it wasn't with Register.com, but the hosting company that I decided to use. They couldn't transfer/activate the domain because their scripts only checked the database with Network Solutions. They sent me the DNS names and IP addresses and I changed them through management of my account on Register.com's website. Other than this little holdup, everything went smoothly as far as Register.com was concerned.
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I had a similiar problem, but it wasn't with Register.com, but the hosting company that I decided to use. They couldn't transfer/activate the domain because their scripts only checked the database with Network Solutions. They sent me the DNS names and IP addresses and I changed them through management of my account on Register.com's website. Other than this little holdup, everything went smoothly as far as Register.com was concerned.