How to get Facebook login on mobile to open the native app if present?

[JeremyKirkham]

I've implemented next-auth with the Facebook provider, and it works as expected in my desktop browser. However, when using my iPhone, I'd expect the login request to open the native Facebook app which is installed on my phone. Instead it opens a web page asking for you to login to Facebook, which negates pretty much the whole point of having a social login. How can I get this to open in the facebook app instead?