Siri Remote Volume Control stopped working after Aug 2021 firmware update.
Siri Remote stopped volume control of my receiver after 16 Aug 2021 (new firmware update?). Unable to re-establish volume control.
Apple TV 4K
Question marked as
Did you verify the current Volume Control settings? A settings inconsistency may have inadvertently reset some things back to default.
Settings﹥Remotes and Devices﹥Volume Control﹥Auto|Receiver via IR|TV via IR|Off|Learn New Device
The last tvOS update was released July 19, so that shouldn’t bring new symptoms a month later.