apache 2.4.29 ubuntu 18.04 VirtualHost ssl redirect not working?

[me <info3@xxxxxxxxxxxx>]

target url: "http://www.cart.example.com/"; works fine.
SSL target url: "https://www.cart.example.com/"; redirect to /var/www/html

However, "/var/www/html" is not a DocumentRoot for any virtual hosts.
Output of "apachectl -S":
VirtualHost configuration:
*:443                  is a NameVirtualHost
         default server example2.com 
(/etc/apache2/sites-enabled/000-default.conf:55)
         port 443 namevhost example2.com 
(/etc/apache2/sites-enabled/000-default.conf:55)
                 alias www.example2.com
         port 443 namevhost ycart.com 
(/etc/apache2/sites-enabled/ycart.conf:55)
                 alias cart.example.com
                 alias www.cart.example.com
         port 443 namevhost yh.com (/etc/apache2/sites-enabled/yh.conf:57)
                 alias hice.example.com
                 alias www.hice.example.com
                 wild alias *.yh.com
*:80                   is a NameVirtualHost
...


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