Angular routing doesn't work when URL typed directly

I've written a CMS in angular which uses the same component for every page, with the content being driven by the url path.

The routing looks like this:

RouterModule.forRoot([
  { path: '**', component: HomeComponent },
  { path: 'about/:name', component: HomeComponent },
])

This works fine when I run it locally in node but when I copy the dist files up to an IIS webserver there's a problem with the routing.

The links direct correctly to the right URL and the pages load fine this way, but entering the URL manually gives a 404.

I would have thought the routing would handle this, and it does when run locally, just not on the IIS server.

Any suggestions as to why this works locally but not on IIS?