Redirect http subdomain to https

hi guys, I have a little problem, I run the command “ee site create domain.com --wpsubdom --php7 --letsencrypt” after which I added a subdomain via dashboard live.domain.com. my problem why live.domain.com can not auto direct to https like the main domain?

You need to get a HTTPS certificate for live.domain.com too. Use the ee site update command to update that domain from http to https