Bnet authenticator problem

I’m trying to set in an authenticator, so i can change the info on my m+ groups and get those +4 slots, but whenever i try to put in a cell number, it says: please enter a post paid phone number. I live in argentina and my phone is post paid. How can i fix it ?

Only thing I can think of:

You can check your registered county in account details:

https://account.battle.net/details#personal-info

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