Thank you for reaching out here in the Community!
I hope you don't mind me answering in English.
By the message you're getting, it sounds like you've probably blocked this song on your mobile device by mistake.
To undo it, you'll need the Spotify app on your mobile. You can download it just to unblock the song if you don't want to use it later.
- Open the Spotify app on your phone.
- Go to Your Library .
- Scroll all the way down.
- Tap Hidden.
- Look for the song and unblock it by taping the symbol.
I hope you'll find this helpful!
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Note: I'm not a Spotify employee.