I’m Helen from Shopify Support. I’m sorry to hear you are having trouble connecting your domain to your Shopify store. Let's figure this out!
Next, please try to connect it using the following steps. By working through each of these, we’ll be able to identify if it is a local issue which is the first step towards identifying the issue:
Please let me know how it goes, and whether any of the above troubleshooting steps resolve the connection. I’m here to help!