There was an error attaching your selected subscription(s). Please try again later.

Dear community members,

When I try to attach a 30 Day Self-Supported Red Hat Enterprise Linux Developer Workstation Evaluation subscription to my sole system I get the error:

"There was an error attaching your selected subscription(s). Please try again later."
I have been trying for more than 1 day, that's why I believe this is an error.
Without this step completed, I can't register my rhel 7.1 workstation properly an get the required updates.

When I try to attach the workstation via subscription-manager-gui I get the error:
Error getting subscription: You must first accept Red Hat's Terms and conditions. Please visit https://www.redhat.com/wapps/ugc

Condition:
This is a fresh install in a laptop

I already tried:
subscription-manager attach --auto
subscription-manager remove --all
subscription-manager unregister
subscription-manager clean
subscription-manager register
subscription-manager register --autosubscribe

Many thanks in advance
Pedro