knox.auth.TokenAuthenticationd does not work in DEFAULT_AUTHENTICATION_CLASSES

[wilfredinni]

I am having problems setting the default rest framework authentication class to knox.auth.TokenAuthentication. It seems that in the views I have to explicitly set authentication_classes = (TokenAuthentication,):
settings.y

REST_FRAMEWORK = {
    #  This is not having an effect at all.
    "DEFAULT_AUTHENTICATION_CLASSES": ("knox.auth.TokenAuthentication",)
}

views.py

from knox.auth import TokenAuthentication


class UserProfileView(generics.RetrieveUpdateAPIView):
    serializer_class = UserProfileSerializer
    authentication_classes = (TokenAuthentication,)  # It won't work without this line
    permission_classes = (permissions.IsAuthenticated,)

    def get_object(self):
        return self.request.user

And if I comment authentication_classes = (TokenAuthentication,) I get:

{
	"detail": "Authentication credentials were not provided."
}

I may be missing something, but I can't figure it out. Thank you!