Hi,
This is an email sent from your cPanel hosting provider (your hosting provider who uses cPanel) and trying to get a certificate include your cpanel and webdisk domain. It issues a certificate with cPanel CA, not let’s encrypt.
However, there are two possible solutions:
- Point your cpanel.stellium.ca / webdisk.stellium.ca domain to the IP.
- Ignore the email, your main domain will still be covered.
For more information, contact your hosting provider.
Thank you