For individual URLs, you may see the “Field Data — The Chrome User Experience Report does not have sufficient real-world speed data for this page” notice, and for Origin Summary, “The Chrome User Experience Report does not have sufficient real-world speed data for this origin.” These mean there is not enough CrUX data available to generate a representative anonymized view of your performance.
Simply put, in order for the CrUX data to become available, you need to get more visitors onto your site! It’s likely you’ll then gain access to the Origin Summary first, because that’s an aggregate across all your pages.