I tried using the 'linkedIn-api-client' package built on Rest.li with python code and recieved the same error. You can check it on the github 1.

import os, sys

sys.path.append(os.path.join(os.path.dirname(__file__), ".."))

from flask import Flask, redirect, request

from linkedin_api.clients.auth.client import AuthClient
from linkedin_api.clients.restli.client import RestliClient



CLIENT_ID = os.getenv("CLIENT_ID")
CLIENT_SECRET = os.getenv("CLIENT_SECRET")
OAUTH2_REDIRECT_URL = os.getenv("OAUTH2_REDIRECT_URL")

print(OAUTH2_REDIRECT_URL)

app = Flask(__name__)

access_token = None

auth_client = AuthClient(
    client_id=CLIENT_ID, client_secret=CLIENT_SECRET, redirect_url=OAUTH2_REDIRECT_URL
)
restli_client = RestliClient()


@app.route("/", methods=["GET"])
def main():
    global access_token
    if access_token == None:
        return redirect(auth_client.generate_member_auth_url(scopes=["openid","profile","email"]))
    else:
        return restli_client.get(resource_path="/me", access_token=access_token).entity


@app.route("/oauth", methods=["GET"])
def oauth():
    global access_token

    args = request.args
    # print(args)
    auth_code = args.get("code")

    if auth_code:
        token_response = auth_client.exchange_auth_code_for_access_token(auth_code)
        access_token = token_response.access_token
        print(f"Access token: {access_token}")
        return redirect("/")
    else:
        return "Authorization code not found", 400

if __name__ == "__main__":
    app.run(host="localhost", port=3000)

When I called the link "http://127.0.0.1:3000/oauth?code={ACCESS_CODE}" with Access code, It reported the same error.

error recieved :-

{"code":"ACCESS_DENIED",
"message":"Not enough permissions to access: me.GET.NO_VERSION",
"serviceErrorCode":100,
"status":403}

Then based on the answer 1 , I tried calling the link again after few minutes and it responded with a status code '302' and without any error. The redirect link was a default app built on django, so it redirected to it.

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