I have created LetsEncrypt certificate for each domain/subdomain in each server and configured it.
The problem is we AWS Load balancer accepts only one SSL certificate. So how to configure Letsencrypt for this kind of configuration ?
You’ll need a single cert with all the (sub)domains instead.
Having one server redirect/proxy /.well-known/acme-challenge/ to the other may make completing the http-01 challenge easier if you’re using that one.