Hi @Matt de Avila 

Can you check your iPhone settings?
 

This should be a lock screen with Deezer:

Go to the iPhone settings and below you will find Deezer:

Go to notifications:

Please check if the settings are like you can see in this screenshot and then go to show previews:

Show previews:

I sorted it out. I needed to delete the app and reinstall it, then everything worked well. But the question is why?

I really can’t tell you this. It could be something with iOS or Deezer. But I’m glad that it’s working again.