Homepod and TV audio volume not syncing

Hello misterrium,

We understand you're having an issue with volume control and we'd like to help.

Check to ensure that both the HomePods are on the same Wi-Fi network. If they aren't this would cause the issue you're having.

We also want to provide a resource that will help you with setting up home theater audio with HomePod or HomePod mini and Apple TV 4K.

Set up home theater audio with HomePod or HomePod mini and Apple TV 4K

Let us know if you have any questions.

Thank you for using Apple Support Communities.

Take care!

First of all you need to set the HomePods as the default audio on your Apple TV and set up Homekit & AirPlay on the ATV assigning the ATV to the same room you assigned HomePods to. You can only have one or one stereo paired as the default audio. On the same wifi network, all signed into the same Apple ID.

Set up home theater audio with HomePod or HomePod mini and Apple TV 4K - Apple Support

Im not clear if you have 2 or 4 HomePods (2 sets of paired). If it’s the latter, then yes you need control centre to manually adjust them but once you’ve set the volume the Siri remote should control all, no matter what volumes they are set to. If you have two HomePods, paired, you shouldn’t need to use control Center, if using the default audio setting. You may also point the remote at HomePods to adjust volume.