Why can't I sync my Facebook/Messenger contacts to my phone?

[ruiDiogo]

Asking from a Huawei Y530-U00 with Android 4.3 installed. Both apps created by Facebook, not some other Android developers. I've managed to go to Accounts>Sync Definitions>'Menu Button'>Sync Now but nothing happens for either Facebook or Messenger.

 

[tube517]

Facebook removed the option to sync contacts.

Facebook stops syncing contacts on Android phones, BlackBerry 10 still best for communications | ZDNet