Thanks for stopping by on the Google Nest Community Forum.
I know how challenging it can be, when you're having issues assigning room for your Google Home/Nest speaker. A few questions: when did the issue start? What Google Home/Nest device do you have? How many home structures and accounts are linked on the Google Home app? What message are you getting when assigning the device into a room?
Below are the steps on how to move a device to a room:
Here's a link that may be helpful to you: Share a home and devices in the Google Home app
Hope this helps.
I’m sorry to hear that after deleting all your “Home” devices, the front yard TV still shows up as “Other Cast Devices”. By the way, what Nest speakers do you have now and why did you have to delete your devices from your Home app? Have you reinstalled your Home app?
Try these steps:
Keep me posted.