In this case I think the validation is the next step when they ask you to set up a DNS record on the domain you typed in, and have their system match it. Obvio

In this case I think the validation is the next step when they ask you to set up a DNS record on the domain you typed in, and have their system match it. Obviously if you typed Outlook.com this would be a challenge for you. Unfortunately that may mean a support ticket and explanation and whatnot, and wasted time. Charitably, it might even mean the customer experiencing friction and going to another provider. So in this case, front ending it seems to make a bit of sense, it’s just really clumsily done.