Follow those steps:

https://medium.com/@lucas.rj.fernandes/spring-security-with-oauth2-and-linkedin-a20874ae7477

  security:
        oauth2:
            client:
                registration:
                    linkedin:
                        client-id: ${clientId} 
                        client-secret: ${secretId}
                        scope: openid, profile, email, w_member_social
                        redirect-uri: "{baseUrl}/login/oauth2/code/{registrationId}"
                        client-name: LinkedIn
                        authorization-grant-type: authorization_code
                        provider: linkedin
                        client_authentication_method: client_secret_post
                provider:
                    linkedin:
                        authorization-uri: https://www.linkedin.com/oauth/v2/authorization
                        token-uri: https://www.linkedin.com/oauth/v2/accessToken
                        user-info-uri: https://api.linkedin.com/v2/userinfo
                        jwk-set-uri: https://www.linkedin.com/oauth/openid/jwks