Are you watching Netflix in English or another language? What are your TV’s audio settings set to? On your Netflix account, be sure to have the Streaming Quality setting set to High or Auto.

Thanks for your quick reply.

Yes I do watch netflix with original english audio (5.1) option

My current TV sound options:

DTV Audio Setting - Dolby Digital Plus / Auto → this does not make any effect tho

Digital Sound Out - Pass Through / Auto → same effect

eArc - ON → when it’s off it doesn’t change anything too

I was able to boost quality from PCE to Dolby Digital Plus changing Digital Sound Out from PCE to Pass Through but I have no idea what else can I do to enable Atmos.

Keep your audio settings set to Dolby Digital Plus and Pass Through.

Did you check your Netflix account to be sure the Streaming Quality setting is set to High or Auto?

Yes I changed from AUTO to HIGH. No effect. 

What specific content are you testing on Netflix?

I found some list but none of them worked in Atmos like:

Thunder Force or The Witcher 

Both are claimed to support atmos.

Perhaps check the LG TV is running on the latest firmware, which I think should be v03.23.05 and maybe try uninstalling the Netflix App and reinstalling from the LG App Store.

Let me point that I haven’t tried any other source of atmos than Netflix. Maybe it’s not Netflix app issue. What else could I check online on TV?

If you have a Disney+, Prime Video, or VUDU subscription/account, you should be able to test Atmos content on those apps. Test any of the Avengers or Star Wars films on Disney+ and the Jack Ryan series on Prime Video.

Unfortunately I don’t subscribe them. Only netflix.

The only other things I can think to try is using the Auto setting rather than Dolby Digital Plus with the Pass Through setting. Also make sure the TV’s firmware is up to date and try unplugging the TV and Arc from power for a couple of minutes.

Anyway I will try to find some atmos file to confirm whether or not it’s netflix issue or general TV settings.

Try testing this Atmos test tones file:

https://amp.reddit.com/r/sonos/comments/hc21uu/dolby_atmos_512_test_video_file_download_link/

It should show the wording ‘Atmos’ with the DD logo in the Netflix App by the Movie title anyway - the "6 Underground’ movie is one such example, see screenshot from my LG C9 TV Netflix App.

If it does not show that information, then the App/Subscription is the area to perhaps focus on.

Oh I am fool…. I was sure I have Premium subscription..rather than I have Standard one.

Once I upgrade it I will drop a message if it helped.

Thanks for tip anyway!

After plan upgrade ATMOS is working :) 

Hi mikee

i had the same problem than you

you have to go to connectivity and there link your arc sonos to the LG