Trying to sync an iPhone we use as an iPod. It says that 32 tunes couldn’t be put on the iPhone as the computer isn’t authorised. Press the authorise button, it says computer is authorised. The phone shows up in my devices and is logged on using my apple id.
Any ideas?

Music from more than one source (iTunes account) ?

The 32 songs were bought from my iTunes account.

and the rest of the music ?

I recall you are allowed to authorize 5 computers max, have you reached the limit. Just trying to guess really. I had a problem years ago when I had bought music from one account and then added a second.

Convert the 32 songs to a high bit rate mp3, instead of the AAC or m4a file you get from Apple. Then add the mp3s.