So I have been trying and nothing is working. I follwed all the below articles:
https://www.reddit.com/r/homeassistant/comments/18g7kwz/adding_mysa_thermostats_in_home_assistant/
https://www.reddit.com/r/homeassistant/comments/jzvw92/mysa_thermostat_integration_how_to/
and others that basically say the same thing - I have no issue getting it into the Mysa App, HK sees it and so does HA but both fail to add it and timeout - i dont even know where to start looking