Lulu here from the Shopify Support team. Thanks for reaching out here, and I'll be more than happy to help you out.
Sorry to hear you are having trouble using your domain, this would usually happen if this domain was connected to another Shopify store. Did you have this domain connected to an old store of yours in the past? I will need you to show ownership of that domain so I can look into removing it from any stores for you. Can you please send a screenshot of the interface/control panel of your third party domain provider and it must show the domain name and the name of the account owner logged in. Something like this would suffice:
Please pass that on here once you get it and if you remember the name of your older store with this domain connected, that would be super helpful too.
Lulu | Social Care @ Shopify
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