Some sad news for users with a Nest product: Nest is no longer accepting new developer accounts. This means that if you bought a Nest thermostat, you are no longer able to access YOUR data.
New Home Assistant users will not be able to integrate their Nest products. Home Assistant users that have already integrated Home Assistant with Nest are not affected.
We hope that Nest will implement a new program or add support for locally controlling the Nest thermostat, if they do, we will update this post. Until then, we can no longer recommend buying or using any Nest product.
We're currently restructuring our developer program and are no longer accepting new developers to the program or performing client integration reviews for existing developers until the new program is implemented. Stay tuned for further details and announcements.
— Nest (@nest) January 16, 2019</blockquote>
This is a companion discussion topic for the original entry at https://www.home-assistant.io/blog/2019/01/24/nest-cannot-access-data/