Single analytic board for multiple site instances with different domain names

I have server with huge adminPanel which is provided for many clients, and now I need to collect and analyze usage statistics.

I create project on GA site with fake domain name (name required), and connect web app to new project using gtag.js and given AccountId (UA-xxxxxx-x). Server and web-app running on localhost.

So the problem is there are no any hits registering on GA server when i triggering gtag actions (init,send,...).

Is it possible configure GA project (or gtag api) to ignore domain verification(?).