Make sure your mobile SoundCloud app is updated to the latest version via the App Store or Google Play.

Sometimes the connection doesn't happen on the first try. If you are struggling to get the activation code to work, try these quick fixes:

SoundCloud’s mobile activation is a one-time step for premium subscribers. Once done, you can seamlessly switch between devices (phone, tablet, computer) without reactivating. For any persistent issues, contact SoundCloud Support directly through their help center.