The Mark ii’s home assistant skill does not use the old integration.
The new skill operates 100% on the mycroft and talks to the HA server over the API, no configuration changes in HA are necessary.
The snippets nerlins has posted will not work on the Mark ii. Currently there is no way to send notifications from HA to the new HA mycroft skill on the Mark ii, I’ve opened a feature request here: Sending notifications from HA to the mycroft · Issue #115 · MycroftAI/skill-homeassistant · GitHub
more info here: Mycroft Mark II with Home Assistant - #2 by goldyfruit