HTTP to HTTPS Redirection not working

I am trying to force my website to redirect HTTP traffics to the HTTPS and I have verified that the htaccess file is getting accessed, but the redirect is not occurring. I have a valid cert for the site and the HTTPS version works fine but whether I type in http://bizappln.com or http://www.bizappln.com, I still get taken to the HTTP version.

Why HTTPS redirection failed at that place? Any suggestions?

.htaccess code

RewriteEngine On

RewriteCond %{SERVER_PORT} !=443 [OR]

RewriteCond %{HTTP_HOST} !^www\. [NC]

RewriteRule ^(.*)$ https://www.bizappln.com/$1 [R=301,L]