When I log in to that account, it shows me the following screen:
Let's get started
You'll need an account before you can deploy any applications. Account names can contain letters, numbers and hyphens, but can't start with a hyphen or a number, and can't end with a hyphen. Pick an account name below to proceed.
And it shows a text box for entering the domain name. When I enter any domain name and click "Save", I get the following error and I cannot progress any further:
Request Validation Error: : field 'name': is invalid account name