Songs in my library "cannot be played on this iphone" anymore After updating to iOS 10, most of the songs in my library that I could play before now won't sync and the error message I get is 


  Some of the items in the iTunes library, including "Song name", were not copied to the iPhone "iPhone name" because they cannot be played on this iPhone.


But I could play these items before, nothing has changed. 

When I check the media format of one of the items it just says:


kind: MPEG audio file
bit rate: 320 kbps
sample rate: 44.100 kHz
channels: Joint stereo
encoded with: LAME3.99
format: MPEG-1, Layer 3


From what I know this is just an MP3 with constant bitrate, a format that the iphone did support one week ago...
This sounds dumb, but play the affected songs on itunes and resync. It should work.