I am creating my first multisite in Local to do some local testing. I let it use the preferred environment, chose subdirectories and created the site. The base site works great, but I cannot create any subsites, each time I do I get stuck in a redirect loop error. Is there something else I need to add to my wp-config file? Or is it something else?
Happy to help resolve this! Which version of WP are you running?
https://wordpress.org/support/article/wordpress-multisite-domain-mapping/