I cannot redeem code for my FC MOBILE Account

I cannot Redeem code for my EA Account. I used Facebook Account to register and sign for THE FIRST TIME I play the game FC MOBILE, I dont know about your policies. 

I ask some other players and they saay that Facebook Account for FC MOBILE cannot redeem any gift code. I see that unfair.

 Please fix this problem so I have equal rights as other players.

This is the notification from Redeem Page:

And when i go into in-game, I cannot see any link to EA Account or ANY other OPTIONS ?