Python send email using Graph API and Office365-REST-Python-Client

I am trying to send an email using Graph API and Python. I tried doing it with graph explorer and it worked. I found this example: https://github.com/vgrem/Office365-REST-Python-Client#working-with-outlook-api

from office365.graph_client import GraphClient

client = GraphClient(acquire_token_func)

client.me.send_mail(
    subject="Meet for lunch?",
    body="The new cafeteria is open.",
    to_recipients=["fannyd@contoso.onmicrosoft.com"]
).execute_query()

Here's my code:

import msal

dict_ = {'client_id': 'foo', 'secret': 'bar', 'tenant_id': 'etc'}

def acquire_token():
    authority_url = f'https://login.microsoftonline.com/{dict_["tenant_id"]}'
    app = msal.ConfidentialClientApplication(
        authority=authority_url,
        client_id=dict_["client_id"],
        client_credential=dict_["secret"]
    )
    token = app.acquire_token_for_client(scopes=["https://graph.microsoft.com/.default"])
    return token


from office365.graph_client import GraphClient

client = GraphClient(acquire_token)

client.me.send_mail(
    subject="Meet for lunch?",
    body="The new cafeteria is open.",
    to_recipients=['elon.musk@company.com']
).execute_query()

Even though it's exactly like in the example I still get:

TypeError: send_mail() got an unexpected keyword argument 'subject'

Can you help me fix this or provide a different way of sending an email?

I agree with @user2250152, you need to change /me endpoint to client.users[<mail>].send_mail as you are using client credentials flow to get token.

I registered one Azure AD application and granted Mail.Send permission of Application type:

In my case, I used below modified code to send an email using Graph API and Python:

import msal
import requests;

dict_ = {'client_id': 'appId', 'secret': 'secret', 'tenant_id': 'tenantId'}

def acquire_token():
    authority_url = f'https://login.microsoftonline.com/{dict_["tenant_id"]}'
    app = msal.ConfidentialClientApplication(
        authority=authority_url,
        client_id=dict_["client_id"],
        client_credential=dict_["secret"]
    )
    token = app.acquire_token_for_client(scopes=["https://graph.microsoft.com/.default"])
    return token

result = acquire_token()

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 = "sri@xxxxxxxxxx.onmicrosoft.com"  
    email_msg = {'Message': {'Subject': "Meet for lunch?",
                            'Body': {'ContentType': 'Text', 'Content': "The new cafeteria is open."},
                            '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())

Response:

To confirm that, I checked the Sent Items where email sent successfully like below:

Reference: python - Microsoft Graph API's "Access is denied. Check credentials and try again" - Stack Overflow by me