I am following the these instructions for enabling HTTPS on the EC2 instance managed by Elastic Beanstalk. I can see that Elastic Beanstalk creates the /etc/pki/tls/certs/server.crt & /etc/pki/tls/certs/server.key files. However, Elastic Beanstalk is not creating the /etc/httpd/conf.d/ssl.conf file. Manually creating the /etc/httpd/conf.d/ssl.conf file, post environment creation, does enable HTTPS though. I am using Apache server.
P.S. I had to change line 3 to mod_ssl : [] (original was mod24_ssl : [])
You are following instruction for EB platform based on Amazon Linux 1 (AL1). However, it seems that you are using platform based on AL2, where proxy (httpd or nginx) are setup differently then on AL1. Specifically, they should be in .plaftorm folder, not .ebextentions. From docs:
Configuration file location – You should place proxy configuration files in the .platform/nginx and .platform/httpd directories on all Amazon Linux 2 platform versions.
Further details how to setup httpd on AL2 platforms are in Configuring Apache HTTPD.