Facebook messenger notify, cant connect

I’ve been trying to get facebook messeager setup and I keep failing! Ive got the API key but on reboot of HA, i get an error.

- name: Phone
platform: facebook
api_key: (string here)

2017-08-07 06:30:54 ERROR (MainThread) [homeassistant.config] Invalid config for [notify.facebook]: required key not provided @ data['page_access_token']. Got None. (See ?, line ?). Please check the docs at https://home-assistant.io/components/notify.facebook/

I’ve cheked the notify setup and that is working if I use NMA, But Im only limited to 5 calls with that one.