With the arrival of Android 12, not everything has been new and improved. Along the way, other features that were present in previous versions have been lost, such as quick settings for Wi-Fi and data, or the volume control compatibility with your Chromecast.
If you are one of the privileged few who already have Android 12 on their device, and you like to send content from your mobile to your Chromecast
Android 12 cannot control your Chromecast volume
This issue was initially detected last August, with the launch of Android 12 beta 3, and everyone thought it was a bug of this preview, but Google has confirmed that this issue is intentional, but with the release of Android 12 Beta 5, they will include some sort of fix. But, as we have already seen, this solution did not come.
With official Android 12 already on the market, more and more users are complaining that they can no longer control the volume of their Chromecast / TV from the volume control of Android 12. Thing that was very convenient, since you were sending content on the TV and touching the volume controls of the mobile adjusted the sound. Now when you touch the controls, the Chromecast or Google TV will notify you that you need to do this on the TV remote control
Given the constant complaints, a Google employee had to confirm that Chromecast volume controls are disabled on Android 12 due to “legal issue” that you cannot share in a public place. This “legal problem” appears to be the lawsuit that Sonos filed against Google last year for using its technology in its Google Cast (Chromecast) technology.
Google informs that they continue to work to offer an alternative solution, but doubts it will reach Android 12. If they find a solution, it will surely arrive with Android 12L in the middle of next year, which would leave the Pixel 3 and Pixel 3a unable to control the Chromecast volume from your own volume buttons.
Via | 9to5Google