Erro 401 "generalException" ao criar item em lista do SharePoint via Microsoft Graph API

Hello Bruno Gomes da Silva,

I understand you are trying to create an item in a SharePoint list using Microsoft Graph with app-only authentication and getting a 401 generalException error. This usually happens when the app doesn't have the correct permissions, or those permissions haven't been approved by an admin.

Initially, I too got same error when I ran your code without granting Application type permission:

Since you're using the client credentials flow, your app needs Application type permission like Sites.ReadWrite.All with admin consent like this:

After that, run below sample python code that first creates a new item in the list and then lists all items.

import requests
from msal import ConfidentialClientApplication

CLIENT_ID = "appId"
CLIENT_SECRET = "secret"
TENANT_ID = "tenantId"

SHAREPOINT_SITE_ID = "siteId"
LIST_ID = "listId"

AUTHORITY = f"https://login.microsoftonline.com/{TENANT_ID}"
SCOPE = ["https://graph.microsoft.com/.default"]

app = ConfidentialClientApplication(
    client_id=CLIENT_ID,
    authority=AUTHORITY,
    client_credential=CLIENT_SECRET
)

token_result = app.acquire_token_for_client(scopes=SCOPE)

if "access_token" not in token_result:
    print("Authentication failed:")
    print(token_result)
    exit(1)

access_token = token_result["access_token"]

headers = {
    "Authorization": f"Bearer {access_token}",
    "Accept": "application/json",
    "Content-Type": "application/json"
}

# Create new list item 
create_url = f"https://graph.microsoft.com/v1.0/sites/{SHAREPOINT_SITE_ID}/lists/{LIST_ID}/items"
payload = {
    "fields": {
        "Title": "Item created with Graph API"
    }
}

create_response = requests.post(create_url, headers=headers, json=payload)
print(f"Create Status: {create_response.status_code}")
print("Create Response:", create_response.text)

# List all fields of all items
list_url = f"https://graph.microsoft.com/v1.0/sites/{SHAREPOINT_SITE_ID}/lists/{LIST_ID}/items?expand=fields"
list_response = requests.get(list_url, headers=headers)

print(f"\nList Status: {list_response.status_code}")

if list_response.status_code == 200:
    items = list_response.json().get("value", [])
    print("Items found:", len(items))
    for item in items:
        print(f"Item ID: {item['id']}")
        for key, value in item.get("fields", {}).items():
            print(f"  {key}: {value}")
        print("------")
else:
    print("List Response:", list_response.text)

To confirm that, I checked the same in SharePoint site where item created successfully like this:

Let me know if you still need help with setup or testing. Happy to assist.

Hope this helps!

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