Apple TV 4K to TVios
Since upgrading my Apple TV 4K to TVios 14.4 - I have no sound on Netflix, Prime Video or AppleTV App via my soundbar. Sound for other apps eg Iview, SBS on demand is OK
Apple TV HD, tvOS 14
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Check the Audio Format, as output by the Apple TV,
and verify that it matches the speaker setup.
If your soundbar supports PCM Multichannel over HDMI, then leave the setting at Auto.
If your soundbar supports Dolby Digital 5.1 over optical, then change the setting to Dolby Digital 5.1.
If your soundbar supports Stereo over wireless, then try changing the setting to Stereo.