App store connect API returns 401

Hello, following the practices use on: https://developer.apple.com/documentation/appstoreconnectapi/generating_tokens_for_api_requests

I used Python, and uses pyjwt and request library in attempt of making requests

I created my jwt header and payload like this

jwt_header = {
  "alg": "ES256",
  "kid": MY_KEY_ID,
  "typ": "JWT"
}

jwt_payload = {
  "iss": MY_ISSUER_NUMBER,
  "iat": time_now,
  "exp": time_10_min,
  "aud": "appstoreconnect-v1"
}

and jwt can encode successfully without error

jwt_token = jwt.encode(jwt_payload, MY_SECRET_KEY, algorithm="ES256", headers= jwt_header)

but really when I try to make a get request with

get_app_id_endpoint = "https://api.appstoreconnect.apple.com/v1/apps"

headers = {
  'Authorization': f'Bearer {jwt_token}',
  'Content-Type': 'application/json'
}

response = requests.get(get_app_id_endpoint, headers=headers)

it always gets a 401 response. Is there anything that need to be changed here? I have tried sosme of the solutions found online such as

1. take out "alg" field in jwt_header
2. take out "iat" field in jwt_payload
3. cast time_now and time_10_min (UNIX epoch time) to integer
4. take out Content-Type filed in headers

but issue remains, what could I possible do here to get over it?