Why my unlock code is not working for my Asus Zenfone 2E?

A

AC Question

I made a request to AT&T to unlock my Asus Zenfone 2E as I moved back to France.
I received the unlock code but it is not working!

I tried couple times and it says that there's an error to unlock the network. It's difficult and expensive for me to call AT&T in the U.S.

Please, some help needed!
 

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