Hello! Thank you for providing such a detailed description of your situation, which was very helpful in troubleshooting.
The issue you're experiencing (Disney+ works fine but Netflix doesn't output Dolby Atmos) is indeed frustrating, but it's a relatively common issue, often rooted in device authentication or signal handshake issues rather than your Poseidon D80 Boom itself.
Restart Tip: Completely power off both the TV and the soundbar (unplug the power cord and wait for one minute), then power them back on. This clears temporary cache and error states and reestablishes audio handshake.
Check Netflix audio settings: While playing a video, press the Menu button on your remote and check for different audio tracks under "Audio" or "Language."
Try Another Port: If your TV has multiple HDMI (eARC/ARC) ports, try switching the soundbar to another port and reassigning the eARC function in the TV settings.
We hope the above information is helpful, and we welcome any additional information! We'll do our best to assist you with this issue!