I am blocking entirely on the development of a feature that will be available in a plugin, to briefly explain it is a feedwall project that includes several social networks (facebook, instagram, youtube, twitter and linkedin), the functionalities for these networks are operational except for a network.. Linkedin.
So, the feature is intended to connect to the Linkedin API via a login button that sends the permissions necessary for proper operation (normally hm), the user connects, Afterwards, it is automatically redirected to the administration part and sees that it is well connected.
Through my tests, I use a user who does not have a company connected to his Linkedin account, then I try to recover his feed, but I still have the same error 403.error image:
Which basic represents a lack of rights when acquiring the user token.authorisation image:
