Hi !
Thanks for your reply, i found the solution thanks to you !
I tried checking my access token at https://graph.facebook.com/me?access_token=MY_TOKEN, and found out that it was an access token for my facebook user profil and not my facebook page.
Actually, when i clicked on ‘Generate access token’, the label ‘user or page’ automatically switched to ‘Token User’, and the token generated was for my user profil, not my page.
To fix that, i had to switch the label ‘user or page’ to ‘App token’, and DON’T click on ‘Generate access token’ again. The access token will automatically change and work for my facebook page.