Dashboard might not populate for a few reasons. The main reason a dashboard isn't populating is either because the DNS records are not set up correctly or because the sales channel is not set up properly. The loom video below shows how to easily check to see if either of those issues could be causing the dashboard not to populate.
https://www.loom.com/share/a52335d5d0f04c0cb7d47c9afc70e49a?sid=17839000-b9a5-4adc-96e0-b4b8d979d14a