The AAAA is the only one used for generating certificates. It uses the Let’s Encrypt ALPN verification challenge.
So you did the DNS verification flow to try and resolve the issue initially?
All we get is:
Incorrect TXT record "x" found at _acme-challenge.your.hostname
Looking at it again and it seems like you have the wrong thing setup. It used to be setup right but now the TXT record is completely wrong. It seems like you’ve set the TXT record to the value we need as a CNAME, not as a TXT.
You need a CNAME
_acme-challenge.your.hostname. pointing to
your.hostname.xyz.flydns.net., but it looks like you have a TXT with the value of
your.hostname.xyz.flydns.net.. If you have both, you need to remove the TXT. I remember this worked earlier Today where a TXT query returned the correct value, recursively fetched from the provided CNAME.