I need help to install and config ssl certificate

[Nalshaamy]

Hello !
I run this comand
sudo certbot --nginx -d siraterp.pro -d www.siraterp.pro

Account registered.
Requesting a certificate for siraterp.pro and www.siraterp.pro
An unexpected error occurred:
No such authorization

Certbot failed to authenticate some domains (authenticator: nginx). The Certificate Authority reported these problems:
Domain: siraterp.pro
Type: dns
Detail: no valid A records found for siraterp.pro; no valid AAAA records found for siraterp.pro

Hint: The Certificate Authority failed to verify the temporary nginx configuration changes made by Certbot. Ensure the listed domains point to this nginx server and that it is accessible from the internet.

[Osiris]

@Nalshaamy

Detail: no valid A records found for siraterp.pro; no valid AAAA records found for siraterp.pro

This is quite self-explanatory I'd say.

While you have an A RR configured in the DNS zone for the www subdomain, no such record exists to configure an IP address for the apex domain siraterp.pro. See e.g. siraterp.pro | DNSViz.