Apple is rolling this out progressively. It is becoming available slowly, song by song, person by person, over time. A lot of confusion is being generated by people not getting the Atmos logo or not seeing lossless or whatever else.
Just wait.
Give it a day or two. These kinds of systems have data spread literally all over the world and it takes days to copy it all everywhere and clear caches and so on. If you go to the Browse tab/view and find the spatial audio demo playlist and you don't see Atmos enabled for every single track in there then the service isn't fully rolled out for you. Even once you do see all of them tagged properly, you may still have other tracks on the service that haven't updated for you.
Just wait. It'll roll out.
Just wait.
Give it a day or two. These kinds of systems have data spread literally all over the world and it takes days to copy it all everywhere and clear caches and so on. If you go to the Browse tab/view and find the spatial audio demo playlist and you don't see Atmos enabled for every single track in there then the service isn't fully rolled out for you. Even once you do see all of them tagged properly, you may still have other tracks on the service that haven't updated for you.
Just wait. It'll roll out.