My name is Aaron, I'm a guru here at Shopify!
Just wanted to let you know I've sent you an email on this - looking into this more will require getting a closer look at the invoicing records for your store. To check on that, we just need authorization to go in and have a look - get back to me via that email, and that'll give us the authorization we need to get to work!
Aaron | Shopify Guru
Hello Aaron, I'm having the same problem. I am yet to buy a domain name but when I choose the available name and select Buy Now, a red 'error' box pops up at the top of the screen saying 'please try again' then an option to edit store information. However I can't see anything wrong with my store information that would stop me from buying a domain name. Everything is filled out and complete except for a Domain name. Please help.
Helen here from Shopify Support. I’m sorry to hear you are having trouble purchasing a new domain. Let’s get to the bottom of this!
In addition to your store address found in ‘Settings > General’, the other store information that can affect a domain purchase is your billing information. First, please ensure that there are funds available on your payment method, and then check that the following criteria are met for your method of payment.
Hope this helps! However, if adjusting the payment method criteria still does not let you complete your domain purchase, just let me know and I’ll investigate this further for you.