Hi there. Not all content on streaming apps will have 5.1 stream available always. It is also important to take a note on what method is uses by streaming apps for 5.1 audio. Some use Dolby Digital Plus and some just use Dolby Digital. If your sound bar or home theater is not equipped with any of the decoder then you will not get 5.1 surround for that particular stream. But Stereo (PCM) should always be available to get you basic stereo at least. I am guessing that's what is happening on your side.
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