I had lucky today and could download Tidal version 2.26.1 on my FireTV 4K. An extraction did not work because I could not install adb ....
Fortunately, I can withdraw this statement, since the update to 2.26.1 was also available on my 2015 Nvidia ShieldTV today and an Atmos output is possible.
Short information about my Setup. I have an Onkyo TX-NR656 and the FireTV and ShieldTV are connected to the HDCP 2.2 Input. A 7.1 system is connected to the AVR. An old (8 years) Sony FullHD television is connected to the video output.
Now the surprising. With my ShieldTV I can stream Atmos and I also get an Atmos/DD+ Input displayed on the AVR. On the FireTV Stick I get a message in Tidal that it is streaming Atmos, but only DD+ 5.1 arrives at the AVR. Either it's a bug, it's because of my non HDCP 2.2 compatible FHD TV or something else. Of course it can also be that I get a 5.1 stream because my system is Atmos compatible, the FireTV recognizes it, but still only outputs 5.1, because my TV is not HDCP2.2 compatible. I can't explain it.
So it is possible to stream 5.1 at Atmos titles but it is not made available to us ... annoying for people who have no Atmos setup ... it sounds still great in 5.1.
Edit:
For the Guys with AndroidTV/ShieldTV: TIDAL Music - Hifi Songs, Playlists, & Videos 2.26.1 APK Download by TIDAL - APKMirror (Maybe it will work on FireTV too)
Another annoying fact is that Disney+ is able to stream Dolby atmos on the 2015/2017 Nvidia ShieldTV's and until now tidal officially only works on the 2019 model ... very, very annoying ...
Source: https://www.nvidia.com/en-us/geforc...-app-now-supports-dolby-atmos-on-all-shield-/
Fortunately, I can withdraw this statement, since the update to 2.26.1 was also available on my 2015 Nvidia ShieldTV today and an Atmos output is possible.
Short information about my Setup. I have an Onkyo TX-NR656 and the FireTV and ShieldTV are connected to the HDCP 2.2 Input. A 7.1 system is connected to the AVR. An old (8 years) Sony FullHD television is connected to the video output.
Now the surprising. With my ShieldTV I can stream Atmos and I also get an Atmos/DD+ Input displayed on the AVR. On the FireTV Stick I get a message in Tidal that it is streaming Atmos, but only DD+ 5.1 arrives at the AVR. Either it's a bug, it's because of my non HDCP 2.2 compatible FHD TV or something else. Of course it can also be that I get a 5.1 stream because my system is Atmos compatible, the FireTV recognizes it, but still only outputs 5.1, because my TV is not HDCP2.2 compatible. I can't explain it.
So it is possible to stream 5.1 at Atmos titles but it is not made available to us ... annoying for people who have no Atmos setup ... it sounds still great in 5.1.
Edit:
For the Guys with AndroidTV/ShieldTV: TIDAL Music - Hifi Songs, Playlists, & Videos 2.26.1 APK Download by TIDAL - APKMirror (Maybe it will work on FireTV too)