Hello! I am having the same issue here. I imported a fully functioning multisite from kinsta and was unable to access the subdomains from the local install. I followed what Todd advised and have changed the DOMAIN_CURRENT_SITE in wp-config.php to my local url and added the subdomains to the local hosts file. When I looked in wp-admin/network/sites.php I have nothing relevant to change. With these updates I’m still unable to access the local version of my sites subdomains. Please, help! Thanks.