After we opened up the Google Home App, we accepted the Terms & Conditions and Location Permissions.
We then set up the Google Home with a local Wi-Fi network. The Google App automatically used the password that the Huawei P10 has already recorded for this Wi-Fi network so you don't need to manually input it again.
After the setup was completed, we went to the Listen section of the Google Home App to install the Google Play Music App.
Once installed, we opened up the Google Play Music App and clicked the Cast button on the upper right of the App browser. We could see our Google Home device being detected as 'Living room Home' as the cast destination. We then selected a song to Chromecast to the Google Home.
However we got a notification saying it wasn't able to play the song that we have selected. Instead we would need to upload the song to Play Music from a computer in order to play it.
We then tried rebooting the Google Home and selecting another song to Chromecast to the Google Home. This time we were able to complete the casting process successfully without having the warning of the song not being able to be played. We could then continue to select and Chromecast other music on the Huawei P10 to the Google Home with no issues.