Hi, @landonventure . I’m happy to help you out with this!
This error message can happen if our system belives a domain is still connected to a store. In order for us to help further with this, please contact our support team through the Help Center here. We can’t see more details about this domain here over the Shopify Community, but if you speak with us through the page I shared we can see more information to help with this.
Please let me know if you have any questions in the meantime!