Cannot register .scot domain

I am trying to add tommysheppardmp.scot to the list of domains under my license and it will not be accepted by the form.
I have tried:
http://tommysheppardmp.scot/
http://www.tommysheppard.scot
tommysheppard.scot

Please advise ASAP why this domain cannot be added. Note that easyBlog is already installed.

Thanks

Craig

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