Play/pause buttons launches iTunes instead of playing/pausing the Deezer app
Solution 1:
Found the answer on the Deezer community forum:
You have to allow Deezer the accessibility rights, go to:
- System Preferences
- Security and Privacy
- Privacy tab
- Choose "Accessibility"
- Add "Deezer" to the allowed software
You'll have to unlock the configuration by clicking on the lock and enter your system password.
The original answer can be found here.