Let's Debug

Test result for da-demo.xyz using dns-01

A test authorization for da-demo.xyz to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
DNS problem: SERVFAIL looking up TXT for _acme-challenge.da-demo.xyz

Submitted Dec 31 04:18:40 2019. Sat in queue for 1ms. Completed in 2s. Show verbose information.