Sonoff Mini 4 Extreme link with googlehome


I Just setup a sonoff mini r4 Extreme with a light. I setup this device on ewelink app and all work right. But i cannot link the app to my Google home account. When I try to link the ewelink app Google show me this message:

I’ve Just delete the data and the cache of Google home and reinstalled the app, but nothig happens.
How can I link Google to my sonoff?

Thanks to all!