Thanks for the reply
Just tested with no luck. error:
Graph returned an error: (#200) If posting to a group, requires app being installed in the group, and \ either publish_to_groups permission with user token, or both pages_read_engagement \ and pages_manage_posts permission with page token; If posting to a page, \ requires both pages_read_engagement and pages_manage_posts as an admin with \ sufficient administrative permission
I cannot figure out if this message for permissions come out from my site or from my facebook app