Website Cannot Be Reached by Googlebot

Google keeps reporting 'Page Cannot Be Reached" http://www.certifiedmaillabels.com/

We are trying to get Google to validate our website for Google Advertising and it keeps reporting it fails. Google reports the site is NOT mobile-friendly. They suggest using this link to validate. https://search.google.com/test/mobile-friendly

We have validated the HTML code and it passes to be mobile-friendly, however, when trying to access by URL the test fails because it cannot access the page. (see attachment).

There’s no attachment, but have you checked your Firewall Event log for blocked requests by Google?

Would you happen to have any of the Bot Fight Modes enabled? Or some other Firewall Rule?

Google keeps reporting 'Page Cannot Be Reached" 

We are trying to get Google to validate our website for Google Advertising and it keeps reporting it fails. Google reports the site is NOT mobile-friendly. They suggest using this link to validate. https://search.google.com/test/mobile-friendly

We have validated the HTML code and it passes to be mobile-friendly, however, when trying to access by URL the test fails because it cannot access the page. (see attachment).

May I ask if there is any Super Bot Management option being enabled or Firewall rule setup at Cloudflare for your domain?