I am trying to issue SAN certificate for multiple domains using DNS challenges. Does Let’s Encrypt server remember domain ownership record for a domain once added? Or, do I have to solve DNS challenges every time I issue/renew certificate?
Authorizations last for 10 months at the moment (or at least lasted the last time I authorized a domain), so you don’t need to reauthorize every time you issue a new certificate.
Thanks for your answer @veeti. Is there any way to check if a subdomain is already verified for a given let’s encrypt account?