Multiple Wordpress sites on a single droplet / One site is working, second gives White screen of death Why?

System information: LAMP installed on Ubuntu 18.04

I have two WordPress websites on Digital Ocean droplet, let’s say domain1 and domain2. I set up 2 virtual hosts. My domain2 located on /var/www/domain2 works fine but

domain1 is redirecting to /var/www/html instead of /var/www/domain1. Besides this, when I copy all files of domain1 to /var/www/html for testing purposes and hit to domain1, it’s giving white screen of death. **Additionally: ** When I put a basic index.html file, it shows properly. But still, it shows the index.html file of /var/www/html

Let’s encrypt already installed for both domains.

Here the contents of relevant files:

/etc/apache2/sites-available/domain1.conf :

 UseCanonicalName On

<VirtualHost *:80>
        ServerAdmin domain1@gmail.com

        ServerName domain1.com
        ServerAlias www.domain1.com

        DocumentRoot /var/www/domain1

        <Directory /var/www/domain1/>
            Options FollowSymLinks
            AllowOverride All
            Require all granted
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined
RewriteEngine on
RewriteCond %{SERVER_NAME} =domain1.com [OR]
RewriteCond %{SERVER_NAME} =www.domain1.com
RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]

</VirtualHost>

/etc/apache2/sites-available/domain2.conf :

UseCanonicalName On

<VirtualHost *:80>
        ServerAdmin domain2@gmail.com

        ServerName domain2.co
        ServerAlias www.domain2.com

        DocumentRoot /var/www/domain2

        <Directory /var/www/domain2/>
            Options FollowSymLinks
            AllowOverride All
            Require all granted
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined
RewriteEngine on
RewriteCond %{SERVER_NAME} =domain2.com [OR]
RewriteCond %{SERVER_NAME} =www.domain2.com
RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
</VirtualHost>

There is a -le-ssl.conf file for domain2 (coming from let’s encrypt). Strangely there is no this kind of file for domain1. I copied and renamed and configured for domain1 but still no luck.

/etc/apache2/sites-available/domain2-le-ssl.conf:

<IfModule mod_ssl.c>
<VirtualHost *:443>
        ServerAdmin domain2@gmail.com

        ServerName domain2.com
        ServerAlias www.domain2.com

        DocumentRoot /var/www/domain2

        <Directory /var/www/domain2/>
            Options FollowSymLinks
            AllowOverride All
            Require all granted
        </Directory>

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

Include /etc/letsencrypt/options-ssl-apache.conf
SSLCertificateFile /etc/letsencrypt/live/domain2/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/domain2/privkey.pem
</VirtualHost>
</IfModule>

Finally, .htaccess file which is the same for both of websites :

.htaccess:

# BEGIN WordPress
# The directives (lines) between `BEGIN WordPress` and `END WordPress` are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.
<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

I did these if you ask :

• Restart apache after configurations
• enabled the .conf files with a2ensite
• dissabled the 000-default.conf file with a2dissite

Edit: Also, when I google http://my.ip.address it redirects to https://domain1.com with white screen.

Looking forward to your answers!