Thanks for posting here in the Speakers and Displays Community forum. We'd love to help.
A few questions: is this the first time you've set up your Google Home device? In what country are you located? What's the message that you're getting? What other troubleshooting steps have you tried?
The 5 GHz Wi-Fi connection (Wi-Fi channel 149 or higher) isn’t supported in some countries like Europe, the United Kingdom, Australia, Japan, Singapore and Thailand. If you're not in these countries, you can try resetting and setting up your device again.
I look forward to your response.