Validation of the required challenges did not complete successfully. No TXT record found at _acme-challenge.ntdet.distancelearning.ninja

[MichaelDarwin]

I gave up in the end and generated a certificate via another means thank for time and suggestions.

[webprofusion]

Ah that’s a shame, it doesn’t appear to be acme client (or Certify) related though, http validation is still a perfectly good fallback if you don’t need a wildcard.