Connect feature not working properly on the Desktop app.
Tap on UPDATE next to Spotify, if visible. Check to see if the issue you might be experiencing has already been reported and what status. To update, long press on the App Store icon and select Updates. It is a good idea to have the latest version of the app on your iPhone. With each update, Spotify tries to address existing bugs, polish the user experience, and introduce new features or changes.
Note: If a simple restart is not good enough to solve your problem, learn how to hard reboot (or force restart) your iPhone. If you are new to iOS, you may check our guide on restarting any iPhone or iPad model. When you restart your iPhone or iPad, several small app issues and temporary software-level problems are repaired successfully. The steps above also help if you have recently upgraded to Spotify Premium, and it does not reflect or stops working correctly. Next, relaunch Spotify and log in using your credentials.