Hi svehall,
You can hand off audio from your iOS device to your HomePod. HomePod can play audio sent from your iPad. If you want to play audio from other devices that support AirPlay 2, please check out the documentation for that device for details about selecting an audio destination.
The last link in our previous message has more information about that, and may help: Play audio on HomePod using an iOS or iPadOS device
Play audio on HomePod using Control Center
1. To open Control Center on your iOS or iPadOS device, do one of the following:
* On iPhone with Face ID or on iPad: Swipe down from the top-right edge.
* On iPhone with a Home button: Swipe up from the bottom.
2. Tap the audio card, tap
, then select one or more HomePod speakers.

To play audio from other devices that support AirPlay 2, see the documentation for that device for details about selecting an audio destination.
If you have additional questions, please contact Apple Support for assistance. You may be able to reach them here: Contact Apple Support
Thank you.