When I register on legacy license website I get email that says there is a problem and to contact customer service. I get nothing but going around in circles trying to find a way to contact customer service. I tried calling and got transferred at least 4 or 5 times untill finally it just hung up on me. Very frustrating. Its been registered to me since day one, but I had to create a new account after the intel switchover and dont have access to my old info.
It's not clear what you want/need here. Do you need a license for the Quartus software? What version? What device are you trying to access? When you say USB dongle, are you referring to the USB Blaster cable or something else? USB Blaster itself does not require a license, but the Quartus Prime software may depending on the answers to these questions.