Hi @camart
unboundtest reports a curious answer:
https://unboundtest.com/m/A/gocompose.camart.co.uk/TB7GJYMI
;; ANSWER SECTION:
gocompose.camart.co.uk. 0 IN CNAME sam-memset.
So the result is a NXDOMAIN.
Try the same "trick" I've shared yesterday.
Change your DNS, remove the CNAME, create an A record with the ip address of sam-memset.camart.co.uk = 78.31.105.243 (from https://check-your-website.server-daten.de/?q=gocompose.camart.co.uk ), then try to create a certificate.