yes, thats true. I usually login with that ID only.
Anything else is the problem? Initially when I registered my account i tried to link with SAID key and received an error saying - "The support agreement you entered XXX is already linked by XYZUser, you may contact the person to share it with you"
So, I contacted XYZUser person and he gave me access and shared the key from his HP login account.
But still am not able to login. I can login to HP forums and post my issues, but for online documentation link my login is failing.