Can not Install SSL for webmail.domain.com

[mhsolutions]

I build a mail server (only mail)
I used Directadmin legacy 1.67.1, nginx webserver
I set custom webmail.domain.com, follow this URl https://docs.directadmin.com/webser...e-a-wildcard-example-com-subdomain-with-nginx
I have create custom dns_a.conf:

|*if IS_IPV6!="yes"|
webmail=|IP|
mail=|IP|
|*endif|

I have add to directadmin.conf

letsencrypt=1
letsencrypt_list=webmail:mail
letsencrypt_list_selected=webmail:mail

When I install SSL, mail.domain.com ok, but can not install ssl for webmail.domain.com. Only mail.domain.com have SSL, mail and webmail is pointed to IP

Example notice:

LetsEncrypt request successful for:
mail.sgd.ovh
Cannot find domain in the certificate.
However, subdomains have been found instead. Proceeding with them.

Please tell me, what i can do?

Thanks!

 

[Active8]

If you mask your domain name people cant help you with it.
i should say check your DNS settings again

 

[mhsolutions]

I am sure mail.domain.com and webmail.domain.com is point to IP
DNS have it, webmail, mail.
My server have more than 20 domain.
In old server, it's normal

 

[mhsolutions]

Update!

I backup to apache webserver, SSL install successful.
nginx webserver can not install ssl for webmail.domain.com