Hi H.AyacheSouhail,
This forum is to ask questions and comment about developing apps for Office 2013. Your issue is more related with the usage of Office 365, since I am not able to move this thread to the suitable forum, I suggest you post your issue in the forum below.
Reference: http://community.office365.com/en-us/f/default.aspx
Thanks for your understanding.
Best Regards,
Edward
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