Good morning Europeans!
As you've noticed, there's an error message when attempting to finish registration. We are working to resolve this as soon as possible. I'll get back to you as soon I have an update on this.
Not that it really matter at this …
Since you're in the UK I assume you have the EU version. And the normal EU launch is at 23 May, so 3 day early access for the EU starts the 20th I suppose.