I constantly get the error "Store URL is not valid". What's wrong?
If your input 'Store URL' is in the required format i,e, https://www.mystore.com/
and you are still constantly getting a Store URL invalid error, it is likely that your Apache configuration is not set to allow Magento .htaccess to work.
To fix this issue, please do the following:
Locate your Apache configuration file. It is usually at located at one of the following locations on your server:
Enable rewrites, by adding option 'AllowOverride All' as in the following:
Options Indexes FollowSymLinks
Require all granted
'yourMagentoDirectory' path must match the location of your Magento installation on your server file system. After changing the configuration, restart the Apache server.