Hello,

Are you getting the 404 on internal pages only or on your home page as well? If it is only for your internal pages, you need to make sure that Apache mod_rewrite is enabled. You could do that with the following command:

sudo a2enmod rewrite

Then restart Apache:

systemctl restart apache2

Also also make sure that you have the default Wordpress .htaccess rules. You can get the rules form here:

https://wordpress.org/support/article/htaccess/

If you already have the .htaccess rules there, make sure to have AllowOverride enabled in your Vhost as well. The AllowOverride rule should look something like this inside your Apache Vhost:

<Directory /var/www/html>
        Options Indexes FollowSymLinks MultiViews
        AllowOverride All
        Require all granted
</Directory>

If this is still not working. Can you share your Apache config here so that I could advice you further?

Regards,
Bobby