There is a long initial log regarding my different efforts.
Here are the last two records, most of the past are mostly similar.
As seen, first I tried subdomain, then I just tried main domain.
(I changed site URL in the log)
traefik | time=“2021-12-16T07:35:19Z” level=error msg=“Unable to obtain ACME certificate for domains “subdomain.sitename.ru”: unable to generate a
certificate for the domains [subdomain.sitename.ru]: error: one or more domains had a problem:\n[subdomain.sitename.ru] acme: error: 400 :: urn:iet
f:params:acme:error:dns :: DNS problem: NXDOMAIN looking up A for subdomain.sitename.ru - check that a DNS record exists for this domain, url: \n” pr
oviderName=leresolver.acme routerName=squiz-online__do_prod_web-secure@docker rule=“Host(subdomain.sitename.ru
)”
traefik | time=“2021-12-16T07:35:19Z” level=error msg=“Unable to obtain ACME certificate for domains “sitename.ru”: unable to generate a certi
ficate for the domains [sitename.ru]: error: one or more domains had a problem:\n[sitename.ru] acme: error: 403 :: urn:ietf:params:acme:erro
r:unauthorized :: Cannot negotiate ALPN protocol “acme-tls/1” for tls-alpn-01 challenge, url: \n” providerName=leresolver.acme routerName=squiz-onli
ne__prod_do_web-secure@docker rule=“Host(sitename.ru
)”
Though I can paste all complete log too if it helps.