Multisite setup on IIS with subdomains

I finally figure it out. I was missing a binding on my main WordPress site in IIS. I needed to add one for the sub-site, in this case child.example.com, specifying the same IP. After doing that I could successfully browse to the sub-site. Presumably when IIS can’t find any matching binding for the given host name, it just reverts to the default site.

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