See this larger thread here
There are a bunch of community members posting about this same issue. Please follow there and fill out the form that support is requesting.
Hoping to get this resolved.
To keep this topic organized, at this time, I'll go ahead and lock this thread. If you're still experiencing problems, feel free to start a new thread and we'll be happy to help. This thread is merged to the original thread found Here.
Google Nest Help Center
Chromecast Help Center