Thank you for replying
while I waiting, I have the solution by modify feedback post type that come with Jetpack(sorry) and set it to change type capabilities from
‘create_posts’ => ‘do_not_allow’,
to
‘create_posts’ => true,
later I use register_post_type_args instead to change without modify Jetpack directly(prevent the code change for every time Jetpack get version updated)
with auth and rest api now it work.
