子網域總是重定向到主域

Question

我已將我的網域重定向到我的伺服器，並成功配置主網域，如下所示：

/etc/apache2/sites-available/mywordpress.com.conf

 <VirtualHost *:80>

    ServerName www.mywordpress.com
    ServerAlias mywordpress.com

    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/mywordpress.com/public_html

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined

    RewriteEngine off
    RewriteCond %{SERVER_NAME} =mywordpress.com [OR]
    RewriteCond %{SERVER_NAME} =www.mywordpress.com [OR]
    RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
    <Directory /var/www/mywordpress.com/public_html>
            AllowOverride All
    </Directory>
 </VirtualHost>

然後我嘗試像這樣配置我的子網域：

/etc/apache2/sites-available/app.mywordpress.com.conf

<VirtualHost *:80> 
        ServerName app.mywordpress.com
        ServerAlias www.app.mywordpress.com
        ServerAdmin webmaster@localhost
        DocumentRoot /var/www/app.mywordpress.com/public_html
        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

我已經運行了，a2ensite app.mywordpress.com.conf && service apache2 restart但是當我訪問我的子網域時，它仍然將我重定向到我的主網域

我嘗試像這樣配置我的主域 .htaccess：

/var/www/mywordpress.com/public_html/.htaccess

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

<IfModule mod_rewrite.c>
RewriteEngine on

# redirect to https www
RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} ^(?:www\.)(mywordpress\.com)$ [NC]
RewriteRule ^ https://www.%1%{REQUEST_URI} [R=301,L]

# redirect to http subdomain
RewriteCond %{HTTPS} on
RewriteCond %{HTTP_HOST} ^((?!www).+\.app.mywordpress\.com)$ [NC]
RewriteRule ^ http://%1%{REQUEST_URI} [R=301,L]
</IfModule>

但仍然不起作用