So I figured it out. I was having similar errors to this with just about every basic type like TSubClassOf. Apparently when compiling for ios, you must explicitly include everything you are using. I’m not sure why for windows or mac these #include’s aren’t needed but they are for ios. In case anyone comes across this the include for UInterface and TSubClassOf are
#include "Runtime/CoreUObject/Public/UObject/Interface.h"
#include "Runtime/Engine/Classes/Engine/StaticMesh.h"