Www domain SSL Letsencrypt doesn't work

Hy Every one, I’m using ee v4,
I have created a wordpress site as follows: “sudo ee site create example.com --type=wp --ssl=le”
everything is cool, except by the fact that I can’t access my site typing “www” before domain.
I already created a CNAME in my server pointing www to my main domain.
Could anybody help me?