Adding songs to queue via Spotify API even if the user is not listening to anything

[tiborviszneki]

For context:

We are developing a song recommendation platform called https://songslikex.com.

We would like to create a new interaction into the user journey with an "Add song to Spotify Queue" functionality. We were implementing it based on the Developer documentation but it turned out the song is only added to the queue when an active listening session is happening. 

We would like to achieve the following:

- User selects a song on our platform and clicks on "Add song to Spotify Queue"

- The song is added to the queue (even if there isn't any active listening session)

- When the user starts a new session in Spotify, the next song would be ours (because of the queue)

My question is the following: Is it possible to add a song into the queue via the Spotify API even if the user is not listening to anything actively? We couldn't find the solution yet