No preview_url from tracks

[De3Zy]

some time ago when i was working with spotify api, when i wanted to get a track preview_url, example from https://developer.spotify.com/documentation/web-api/reference/get-track :

{
"album": {
"album_type": "compilation",
"total_tracks": 9,
"available_markets": [
"CA",
"BR",
"IT"
],
"external_urls": {
"spotify": "string"
},
"href": "string",
"id": "2up3OPMp9Tb4dAKM2erWXQ",
"images": [
{
"url": "https://i.scdn.co/image/ab67616d00001e02ff9ca10b55ce82ae553c8228",
"height": 300,
"width": 300
}
],
"name": "string",
"release_date": "1981-12",
"release_date_precision": "year",
"restrictions": {
"reason": "market"
},
"type": "album",
"uri": "spotify:album:2up3OPMp9Tb4dAKM2erWXQ",
"artists": [
{
"external_urls": {
"spotify": "string"
},
"href": "string",
"id": "string",
"name": "string",
"type": "artist",
"uri": "string"
}
]
},
"artists": [
{
"external_urls": {
"spotify": "string"
},
"followers": {
"href": "string",
"total": 0
},
"genres": [
"Prog rock",
"Grunge"
],
"href": "string",
"id": "string",
"images": [
{
"url": "https://i.scdn.co/image/ab67616d00001e02ff9ca10b55ce82ae553c8228",
"height": 300,
"width": 300
}
],
"name": "string",
"popularity": 0,
"type": "artist",
"uri": "string"
}
],
"available_markets": [
"string"
],
"disc_number": 0,
"duration_ms": 0,
"explicit": false,
"external_ids": {
"isrc": "string",
"ean": "string",
"upc": "string"
},
"external_urls": {
"spotify": "string"
},
"href": "string",
"id": "string",
"is_playable": false,
"linked_from": {},
"restrictions": {
"reason": "string"
},
"name": "string",
"popularity": 0,
"preview_url": "string",
"track_number": 0,
"type": "track",
"uri": "string",
"is_local": false
}

i was getting a normal url, for example: 

https://p.scdn.co/mp3-preview/3134a5064ac59006fdb3dafbda8f8e5d3bbf844d?cid=b02f2b9a642741d8b6e510979...
- Rest in **bleep** - Brotha Lynch Hung

But now, whatever track it is, preview_url is null, when about couple of weeks ago, it was a normal string (url)

nah man what the actual frick is spotify doing

they been busy making that bs just worse than actually doing sum

pls help