Microsoft Graph API 的“访问被拒绝。检查凭据并重试”

Question

大家好，我是 Microsoft Azure 平台的新手。 我们正在使用 mircosoft outlook graph api 发送邮件。 凭据和一切正常。但是当我们将 api 与 /sendMail 方法一起使用时，它会返回。

访问被拒绝。检查凭据并重试。

authority = f"https://login.microsoftonline.com/{tenant_id}"
app = msal.ConfidentialClientApplication(
    client_id=CLIENT_ID,
    client_credential=CLIENT_SECRET,
    authority=authority)

scopes = ["https://graph.microsoft.com/.default"]
result = None
result = app.acquire_token_silent(scopes, account=None)

if not result:
    result = app.acquire_token_for_client(scopes=scopes)

if "access_token" in result:
    print("Access token created.",result["access_token"])

if "access_token" in result:
    endpoint = f'https://graph.microsoft.com/v1.0/users/{userId}/sendMail'
    toUserEmail = user_email    
    email_msg = {'Message': {'Subject': "Test Sending Email from Python",
                            'Body': {'ContentType': 'Text', 'Content': "This is a test email."},
                            'ToRecipients': [{'EmailAddress': {'Address': toUserEmail}}]
                            },
                'SaveToSentItems': 'true'}
    
    r = requests.post(endpoint,headers={'Authorization': 'Bearer ' + result['access_token']},json=email_msg)
    if r.ok:
        print('Sent email successfully')
    else:
        print(r.json())```