I receive this message when i try to connect my existing domain, which i recently purchased from godaddy “A site with that domain name already exists”.
I’m sorry to hear about the troubles with your recently purchased third-party domain. Since we cannot securely authenticate you over our community forums, the best method to get support for the domain is to login to your store through our Contact Us page.
Once you are logged in, you should then be able to reach out to a Support Advisor that can provide additional support to getting the domain successfully connected.
Let me know if you have any questions or concerns.