That domain is still in use on an account that is currently under a permanent suspension; its use on other accounts is currently forbidden due to this. In addition, you are also only allowed one account, and are NOT allowed to bypass the signup process by utilizing a proxy. As you have been confirmed based on recent activity to be located within Vietnam, a country we currently have in our blacklist, your current account has been suspended as the blacklist exists for a reason.
With the issue being answered and resolved (albeit probably not how you wanted it to be resolved), I am closing this thread.