This article will take you through the possible reasons for a “Domain not found” root cause on an uptime test:

• We are unable to resolve your domain name through Google and Cloudflare DNS services.
• The IP address of your domain may not be pointed to the correct record, this can be resolved by editing the DNS records.
• A recent change to DNS records may require some time to propagate across the internet, the changes must be fully applied in order to be picked up by our testing.
• There may be a problem on the side of your domain services provider which is causing connections from one or multiple locations to fail at the DNS stage.