We'd first recommend making sure that all related notifications are enabled for Spotify on your device. You can double check this by going to your phone's Settings > Notifications > locate Spotify from the list of apps and tap it. You can then take a look for each category listed and toggle on "Display in status bar" for each.
If you're still having troubles after this, we'd recommed perfoming a quick reinstall of the app on your device. You can find the steps on how to do that here.
Let us know how you get on :) We'll be right here if you need more help.
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