Dolby Atmos used to work when playing Atmos music from the Tidal app on my Sony TV but now Atmos tracks only output Dolby Digital plus 2.0 stereo

[u/IndependentVirtual92]

I have a Sony XBR-85X900H and used to be able to listen to music in Atmos format in Tidal outputting via HDMI eARC to a Yamaha CX-A5200 surround processor. All of a sudden, it only outputs stereo when listening to Atmos tracks. I know for certain that before it was actually getting a Dolby Atmos signal as the processor indicated Dolby Atmos as the format being played while now it indicates DD+. I contacted Tidal support and they can't determine what the issue is and concluded the issue is not on their end.

Does anyone with this model TV have the same issue or similar issue with a different model?

[u/Mundane_Pangolin_164]

I don't have the same tv but I do have the same processor and issue. I have not figured it out yet though.