I added 5 different themes to apply the redirects to (as indicated above), and it seems to be working for the subdomains. However, when I try to set a theme for the main domain "multisite.dev", it seems to default to the "subdomain1" theme. Anytime I change the theme to "Subdomain1" it changes the theme for "multisite.dev" as well.
Any idea why this is happening or how to fix it? Or is there something I'm not getting?