Some songs not downloading in lossless quality in Apple Music for iPhone

Ok just one suggestion then. Maybe you are downloading some of your songs using your cellular connection. I suggest checking it from Settings > Music > Downloads. If the download over cellular is turned on, maybe this is causing your problems. So if it is turned on, I suggest turning that off and then redownloading some songs to check. If that is not the source of your problem, then I am also out of ideas.

If I got this right I found the solution to this same problem (though I was having it on my Mac since I only listen to Lossless there). It's not a bug, it's a poorly thought out design flaw in Apple Music. If you have "Download Dolby Atmos" ON, but you have disabled the Dolby Atmos playback feature, even if you have downloaded the Lossless version of a song, Music will prioritise the AAC format because it tries to play the Dolby Atmos version (which you have disabled, so it only plays in AAC Stereo).

What you need to do is turn "Download Dolby Atmos" OFF and re-download all songs in the Lossless format, then you'll be able to listen to them in full quality.

Apple Music has different sound quality options for streaming and downloading. Are you sure your settings are set to download the music in lossless? To check it go to Settings > Music > Audio Quality. Make sure lossless audio is turned on. And make sure you choose downloads to be done either in lossless or in hi-res lossless, and not in high quality.

I’m experiencing the same thing, have tried everything in these comments but still has not resolved.

Im starting to think it’s a bug and hopefully gets fixed in a future update

Please do read my reply to this post as it may help you too.

It worked for me. Thanks