I am implementing social login in angular 6 app with Linkedin using this npm package https://github.com/NarHakobyan/ngx-linkedIn
After clicking on allow popup in the Li
You are using V1.0 of linkedin apis. They have migrated apis to V2.0. Use V2.0 ( doc ) and you won't get this error.
Sample Get request
https://www.linkedin.com/oauth/v2/authorization?response_type=code&client_id=xxxxxxxx&redirect_uri=https://www.yoursite.com/oauth2/callback&state=fooobar&scope=r_liteprofile%20r_emailaddress%20w_member_social