Facebook API: iOs OK, Android KO: empty service response (username)

Facebook API: I m using FB API plugin to use some FB information (name, email).
But I don't get the same results depending on the platform:
- Appery Preview: fb username OK
- iOs : fb username OK
- Android : fb username empty
I've tried with the default Android permissions and with all selected.

What should I do to have with Android the same as with iOs?
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