Thanks for reaching and we're sorry for the trouble this may have caused you.
Try these steps:
If the issue persists, try using a different phone to see if you'll get the same result.
It's me again. How's it going with your devices? Did the shared steps above help?
I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity.
Google Nest Help Center
Chromecast Help Center