The site is too new and has not been crawled yet
A domain registered last week with no links pointing at it has given Google no reason to visit. There is nothing wrong with the site. It is simply not in the queue yet. Submit the sitemap in Search Console and get one or two real links pointing at the domain from anywhere that already gets crawled.
How to test it: Search Console, Pages report. If the URL is listed as Discovered and there is no last crawl date, Google knows the address and has not been yet.