It may be you're launching in a region you haven't launched in before - apparently new accounts may be restricted to 3 regions and you can get this error if you try to use a 4th.
Either way, please contact them on that email address as suggested or use AWS Support from your console (or https://support.aws.amazon.com/#/contacts/aws-account-support/) - even with Basic support you can raise an Account case like this.
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