I can not use mod_rewrite nor tinyUrl

bonjour
The installation routine did not detect a functional mod_rewrite module.
However, the module is well installed and functional on the server, checked with the php apache_get_modules () function.
By the way, I use mode_rewrite that works correctly.
Note that I modified the htaccess of the site root to force the https:

  RewriteEngine On
  RewriteBase /
  RewriteCond %{HTTP_HOST} ^(monsite|www.monsite)\.fr [NC]
  RewriteCond %{HTTPS} off 
 
  RewriteCond %{REQUEST_FILENAME} -f [OR]
  RewriteCond %{REQUEST_FILENAME} -d  
  RewriteRule ^.*/?$            https://%{HTTP_HOST}/index.php [L,QSA]
>

would anyone have any idea about this problem?
merci
RB