Does your form work?
Looking at the contact form example
Temporarily change your form code to:
acf_form(array(
'post_id' => 'new_post',
'post_title' => true,
'post_content' => true,
'new_post' => array(
'post_type' => 'recette',
'post_status' => 'draft'
),
'return' => home_url('merci'),
'submit_value' => 'Send'
));
See if that works
