Generate Certificate for Subdomains of Subdomains

[cdric0701]

Hello,

I am trying to generate a self-signed SSL certificate that supports subdomains of subdomains, such as sub1.sub2.example.com.
However, I am encountering a warning (on the browser) when using the following command:

self-signed-ssl --no-interaction -c 'US' -s 'California' -l 'Los Angeles' -o 'Example Org' -u 'Example Unit' -n 'example.com' -a '*.*.example.com'

The certificate works for *.example.com (if I generate for *.example.com) but fails to cover subdomains like sub1.sub2.example.com.

Is it possible to generate a certificate with self-signed-ssl that supports subdomains of subdomains? If so, could you please provide guidance on how to properly configure the command to achieve this?

Thank you!