HomePod no longer responds to Siri
In the Home app on your iOS or iPadOS device, touch and hold a HomePod.
Scroll down, tap the Settings button, then do any of the following:
- Enable “Hey Siri” requests: Turn on Listen for “Hey Siri.”
- Enable summoning Siri using HomePod touch controls: Turn on Touch and Hold for Siri.
- Enable indicator light when Siri is listening: Turn on Light When Using Siri.
- Hear a chime when Siri is listening: Turn on Sound When Using Siri.
Source: https://support.apple.com/guide/homepod/change-settings-apde6dc8093d/homepod