omniauth: (linkedin) Authentication failure! invalid_credentials

Request phase initiated. Started GET "/users/auth/linkedin/callback?code=...&state=..." for 127.0.0.1 at 2022-09-14 20:50:20 +0200 D, [2022-09-14T20:50:20.537126 #37240] DEBUG -- omniauth: (linkedin) Callback phase initiated. E, [2022-09-14T20:50:21.021252 #37240] ERROR -- omniauth: (linkedin) Authentication failure! invalid_credentials: OAuth2::Error, invalid_request: A required parameter "client_secret" is missing {"error":"invalid_request","error_description":"A required parameter \"client_secret\" is missing"} Processing by Users::OmniauthCallbacksController#failure as HTML

ruby version 3.2.0 rails version 7.0.4

gem 'omniauth' gem 'omniauth-linkedin-oauth2'