Buddy u had urself raised a similar issue with a different user id back in 2020 and even admitted that u were getting Dolby Atmos on Netflix. Here is that thread
Hi All Airtel Xstream Box users, Yesterday I tried in to play "Carnival Row" & "Suspiria" program/movie ( both have Dolby ATMOS ) in Amazon Prime Video app on my Airtel Xstream Box is playing Dolby Digital plus only, and the Dolby ATMOS sound option is NOT been chosen, as my Onkyo...
Now u r saying u r not getting while others have confirmed that on XStream Box they r able to Enjoy Movies / Shows available on Netflix in Dolby Atmos audio
So this itself proves XStream Box supports 4K Resolution as well as Dolby Atomos. U need to check settings or contact LG concerned to know if they have some compatibility issue with XStream Box and request them to sort it out or contact OTT Support team to know if the App they have designed for XStream Box supports these features at present or not. Even if all these issues r sorted still u will get only such content in 4K/Dolby Atmos which has been made available by concerned OTT platform and u will have to subscribe to respective OTT pack which provides access to these features.
I can mention endless documents here which prove that Airtel XStream Box supports 4K as well as Dolby Audio but just for starters here is confirmation from Dolby itself about XStream Box supporting Dolby Atmos Audio...can't be a bigger proof than this. You can also visit Technicolor and Flextronics website and check specifications of XStream Box there and it would clearly mention availability of 4K as well as Dolby Audio