preview_url doesn't give an url anymore

[Luca289]

Hello, I'm writing an app (at the moment is just sperimental) which uses the preview_url given by this API endpoint

https://api.spotify.com/v1/tracks/

This is my workflow, summed up in a few line:

1. Creating my client creds using Client_Id and Client_Secret, both given by Spotify

//this is written in dart

String clientCreds=clientId+":"+clientSecret;
var clientCredsEncoded = utf8.encode(clientCreds);
String clientCredsB64 = base64Encode(clientCredsEncoded);

2. Retriving my token using api/token endpoint

http.Response risposta = await http.post(
    url,
    headers: {"Authorization": "Basic " + creds},
    body: params
);

3. Getting a track info using v1/tracks endpoint

(I get a random track from this playlist)

https://open.spotify.com/playlist/4str4OJTVRLrFUpWMoZywC?si=nxcOSZKHRO6B_YJ--pB5iA)

And it worked since yesterday. Some songs didn't have the preview_url but just a few, most of the song had it. Today it doesn't work anymore, every song has the preview_url = null. I can get every info of a track, like the image, the title, the artist, but the preview_url is equal to null, in every songs. I don't know if it is a problem linked to my account, some sort of limitation (I registered the app with another account with a free plan), but I can't figure it out

[michelleyin]

I'm having the same issue as well, and I'd really like users in my application to be able to hear the preview urls when searching for an item. Is there any reason why for the same track that comes back in user top tracks that has a preview url would turn up nil in the search results?