prevent loading subdomain when using www - laravel

Question

I have a Laravel project, where i am managing domain and subdomain altogether. That domain and subdomains has different functionalities. When I'm loading my main domain like this https://myclearmargin.com/ without using www it is working perfectly. But when I am adding www https://www.myclearmargin.com/ to the url, it's loading the content of a sub-domain. I am unable to find any solution to this, nor I understand where the problem occurs/where should i dig into. Here is my code on routes/web.php
<?php
$siteUrl = env("APP_URL");
$subdomainRoutes = function () {
// all sub-domain routes
};
$mainRoutes = function () {
// all domain routes
}
Route::group(array('domain' => '{account}.' . $siteUrl), $subdomainRoutes);
Route::group(array('domain' => $siteUrl), $mainRoutes);
My project was deployed on apache (centos 8) server. and here is my apache settings for the project.
domain.conf:
<VirtualHost *:80>
DocumentRoot /var/www/html/MyClearMargin/public
ServerName myclearmargin.com
ServerAlias www.myclearmargin.com
<Directory "/var/www/html/MyClearMargin/public">
Allowoverride All
Options Indexes FollowSymLinks
Require all granted
</Directory>
ErrorLog /var/www/html/log/error.log
RewriteEngine on
RewriteCond %{SERVER_NAME} =myclearmargin.com [OR]
RewriteCond %{SERVER_NAME} =www.myclearmargin.com
RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
</VirtualHost>
subdomain.conf:
VirtualHost *:80>
DocumentRoot /var/www/html/MyClearMargin/public
ServerAlias *.myclearmargin.com
<Directory "/var/www/html/MyClearMargin/public">
Allowoverride All
Options Indexes FollowSymLinks
Require all granted
</Directory>
ErrorLog /var/www/html/log/error.log
</VirtualHost>
Can anyone help me out? I am struggling for this for months. Let me know if you need for informations.
TIA