Run the following commands:
echo "action=rewrite&value=letsencrypt" >> /usr/local/directadmin/data/task.queue
/usr/local/directadmin/dataskq d800 2>&1 | tee out.txt
Check if you can find the following with the hostname:
[..] there are 0 attempts left for this domain. skipping.
Run this to fix the issue:
rm -rf /usr/local/directadmin/conf/cacert.pem.letsencrypt_remaining_retries