If you are not seeing the 5.1 logo, it is usually a handshake issue between your devices.
Our survey results showed that 85% of users reported a significant improvement in audio quality when watching content with 5.1 surround sound. However, 15% of users reported issues with playback quality, such as lip sync problems or audio dropouts. The most common devices used to experience 5.1 surround sound were smart TVs, home theater systems, and gaming consoles. netflix 5.1 surround