PCM stereo on Panasonic UB-820 with Arc Ultra

A recent discussion of the same issue:

You’ve searched these forums for the Panasonic? As near as I can tell, Sonos doesn’t handle DTS-HD, so you’ll need to change the signal, either in the Panasonic’s settings, or the TV's settings.

Here is a longish thread which might be of some assistance, but there are more:

LG might also not do DTS.

Thanks for the answer !

I lnow that LG cannot do DTS-HD or DTS:X like Sonos but i wan’t PCM multichanel 

Ok with my PS5 but not with my Panasonic UB-820 why ?

In the 820s audio settings set DTS to PCM rather than bitstream. 

It’s done with 820s audio settings and also with my LG C1 with the setting « passtrough » activate and it’s the same thing…

Perhaps the TV can’t pass LPCM. 
 

My TV is an LG G4. It’s audio settings are set to auto. 

In the discussion link that I posted above, the OP had this to say:

Hallelujah! Thanks everyone for the help. Although I had configured the Blu-Ray to output PCM for DTS and the TV to output Bitstream, I missed turning on eArc support on the TV. I guess I assumed all I had to do was connect the Arc to the eArc HDMI port. I was clued in to this TV setting tweak by @GuitarSuperstar’s reply in DTS-HD 5.1 4K discs suddenly no sound. Now my Sonos app is showing glorious Multichannel PCM 7.1 and it sounds great, even if it isn’t quite DTS HD.

Update: on a whim, I went back into the Blu-Ray’s settings and set it to output Bitstream instead of PCM. I still got Multichannel PCM 7.1 successfully.