Where to find code for homepod

What code?

For setup, either point the iPhone to the Siri screen, or tap “enter passcode manually” on your iPhone for Siri to speak the code.

Set up and use HomePod - Apple Support

1. When asked, center HomePod in the viewfinder on your iOS device to complete pairing. If you can't use your camera, tap Enter Passcode Manually and Siri will respond with a four-digit passcode to enter on your device.