[Python] "The requested item is not found"; Azure AD Application using Python with Planner

I have an Azure AD Daemon application that is attempting to grab tasks from a desired planner. I've gone ahead and provided the necessary application permissions to try and grab the plan. I keep getting a "The requested item is not found" error despite using the correct Planner ID to grab the data. Is there a permission that I am missing or an issue with my code? I typically use VS code to run the python file with the command python application.py parameters.json.

Below is the python code I run for the application.

import sys # For simplicity, we'll read config file from 1st CLI param sys.argv[1]
import json
import logging

import requests
import msal


# Optional logging
# logging.basicConfig(level=logging.DEBUG)

config = json.load(open(sys.argv[1]))

# Create a preferably long-lived app instance which maintains a token cache.
app = msal.ConfidentialClientApplication(
config["client_id"], authority=config["authority"],
client_credential=config["secret"],
# token_cache=... # Default cache is in memory only.
# You can learn how to use SerializableTokenCache from
# https://msal-python.rtfd.io/en/latest/#msal.SerializableTokenCache
)

# The pattern to acquire a token looks like this.
result = None

# Firstly, looks up a token from cache
# Since we are looking for token for the current app, NOT for an end user,
# notice we give account parameter as None.
result = app.acquire_token_silent(config["scope"], account=None)

if not result:
logging.info("No suitable token exists in cache. Let's get a new one from AAD.")
result = app.acquire_token_for_client(scopes=config["scope"])

if "access_token" in result:
# Calling graph using the access token
graph_data = requests.get( # Use token to call downstream service
config["endpoint"],
headers={'Authorization': 'Bearer ' + result['access_token']}, ).json()
print("Graph API call result: ")
print(json.dumps(graph_data, indent=2))
else:
print(result.get("error"))
print(result.get("error_description"))
print(result.get("correlation_id")) # You may need this when reporting a bug


Below is the parameters.json I use with the various ID's required for the application to run

{
"authority": "https://login.microsoftonline.com/tenant_id",
"client_id": "client_id",
"scope": [ "https://graph.microsoft.com/.default" ],
"secret": "Secret_Client",
"endpoint": "https://graph.microsoft.com/v1.0/planner/plans/plan_id"
}


The id names are only placeholders, just imagine them being in there.

Here are the perms currently assigned to the application. Help would be appreciated.

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