When creating a new domain test.example.com and checking the box 'Secure the domain with Let's Encrypt', Plesk assumes that both:
test.example.com
www.test.example.com
need to be covered by the certificate.
The creation fails for obvious reasons.
It is not a major problem, because one can simply select the newly created domain and request a Let'sEncrypt certificate for it, this time NOT checking the box 'Include a "www" subdomain for the domain and each selected alias' that is not available when creating the domain.
It would make sense, to me, to use the same default on both forms and assume one does not want the 'www' subdomain, perhaps only if the domain being created is already a subdomain.
P.S. I am not creating test.example.com as subdomain of example.com because I want them separate (see this question)
test.example.com
www.test.example.com
need to be covered by the certificate.
The creation fails for obvious reasons.
It is not a major problem, because one can simply select the newly created domain and request a Let'sEncrypt certificate for it, this time NOT checking the box 'Include a "www" subdomain for the domain and each selected alias' that is not available when creating the domain.
It would make sense, to me, to use the same default on both forms and assume one does not want the 'www' subdomain, perhaps only if the domain being created is already a subdomain.
P.S. I am not creating test.example.com as subdomain of example.com because I want them separate (see this question)