Thanks for reaching out. Let's check on this further.
A few questions: Is this an initial setup or previously working? If previously working, is there any changes in your Wi-Fi network? How far is your Chromecast from the Wi-Fi router? Are you getting any messages when connecting it to your network? If yes, what was it?
Give these steps a try:
Let me know how it goes.
Just checking in to make sure that you've seen my response. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.