I am testing a WordPress Multisite migration from AWS LightSail to EC2-Litespeed.
The default command from Litespeed installs ssl, that works fine on the Primary domain i.e. etechoxin.com, but on the subdomain it doesn't work i.e. one.etechoxin.com.
whynopadlock site shows this: Domain Matching
Your SSL certificate does not match your domain name! Protected Domains:
You need to acquire a new certificate that covers etechoxin.com, www.etechoxin.com, one.etechoxin.com, and any other subdomain names you may wish. You could instead acquire an apex (etechoxin.com) and wildcard (*.etechoxin.com) certificate (A&W certificate).
Certificate History
It looks like you acquired various combinations of Let's Encrypt certificates then acquired a Cloudflare A&W certificate today.