The error message DNS_PROBE_FINISHED_NXDOMAIN appears when the domain name system cannot resolve a website’s URL into an IP address, making the web browser unable to reach it. The NXDOMAIN in the error code implies that the domain is non-existent.
There are several reasons why this error might occur. It could be due to a misconfiguration or problem with your DNS, or it could be because the domain is not registered or has expired.
In your case, it seem you didn’t setup an IP for your domain. Try to add at least 1 A record for root domain and try again.