Php versions – Lumen Routes shows 404 except root route

I am using Lumen for the first time. I placed my lumen files in folder Test and kept the folder inside /var/www/html path in server. My PHP version is 7.4.3

I have the following routes:

$router->get('/key', function() {
return str_random(32);
});

$router->get('/', function () use ($router) {
return $router->app->version();
});

Below is my htaccess:

<IfModule mod_rewrite.c>
<IfModule mod_negotiation.c>
    Options -MultiViews -Indexes
</IfModule>

RewriteEngine On

# Handle Authorization Header
RewriteCond %{HTTP:Authorization} .
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

# Redirect Trailing Slashes If Not A Folder...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} (.+)/$
RewriteRule ^ %1 [L,R=301]

# Handle Front Controller...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]
</IfModule>

But whenever I try to access http://xx.xxx.xxx.xxx/Test/public/key it shows

The requested URL was not found on this server.

But if I try to access http://xx.xxx.xxx.xxx/Test/public/ it returns me

Lumen (5.7.8) (Laravel Components 5.7.*)

How can I make all other routes also to work?