Hi Pazuleme,
Soundcloud is a separate service compared to Spotify, so they will not link automatically! If you want your music on Spotify, I recommend using sites such as TuneCore (https://www.tunecore.ca/) or CDBaby (https://cdbaby.com/). You basically pay them a certain $ amount or % of earnings, and then they release your music to Spotify, Apple Music and many other streaming platforms!
Hope this helps,
Michael
