Letsencrypt for subdomain

Can I create certificate for internal sub domain using letsencrypt which is not availble in public? But its main domain available in public.

like example.com is available in public but xyz.example.com is not accessible in public and getting from openstack or internal dns

As i am getting error that
Detail: dns :: DNS problem: NXDOMAIN looking up A for

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It’s possible if you use DNS validation. In that case, you would need to be able to automatically create a public TXT record for _acme-challenge.xyz.example.com when you issue or renew the certificate.


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