Not able get email threads for CC and BCC addresses using Microsoft graph api: forward api

Question

I am using microsoft graph api's foward api to fowrad mail with CC and BCC, as I can't add CC and BCC address directly when we use fowrad api, I have created MIME format and added it over headers.

Now I am receiving two mails one for To address(with email thread) and another for To, Cc, and Bcc address (without email thread, but with last mesage).

Expected: mail triggering for To, CC and BCC addresses with email thread.

This is the function, where I construct MIME

def construct_mime_message(self, recipient, email_body, subject, cc_recipients=[], bcc_recipients=[], attachments=[]):
        print(f"Constructing mime message: {recipient}, {cc_recipients}, {bcc_recipients}")

        message = MIMEMultipart()
        message["To"] = recipient

        if cc_recipients:
            cc_header = ", ".join(cc_recipients)
            message["Cc"] = cc_header

        if bcc_recipients:
            message.add_header("Bcc", ", ".join(bcc_recipients))
        message["Subject"] = subject

        html_part = MIMEText(email_body, "html")
        message.attach(html_part)

        if attachments:
            for attachment in attachments:
                try:
                    part = MIMEBase('application', 'octet-stream')
                    part.set_payload(base64.b64decode(attachment["contentBytes"]))
                    encoders.encode_base64(part)
                    part.add_header('Content-Disposition', f'attachment; filename="{attachment["name"]}"')
                    message.attach(part)
                except Exception as e:
                    print(f"Error attaching file {attachment['name']}: {e}")

        message_as_str = message.as_string()
        return base64.b64encode(message_as_str.encode("utf-8")).decode()`

Below is the function to foward mail using fowrad api

def foward_email(self, target_email, external_id, access_token, email_body, subject, to_address, cc_addresses=None, bcc_addresses=None):
        try:
            messages_url = f"https://graph.microsoft.com/v1.0/users/{target_email}/mailFolders/inbox/messages?$filter=conversationId eq '{external_id}'"
            headers = {"Authorization": f"Bearer {access_token}"}
            messages_response = requests.get(messages_url, headers=headers).json()
            message = messages_response["value"][0]
            latest_email_id = message["id"]

            mime_message = self.construct_mime_message(to_address, email_body, subject, cc_addresses, bcc_addresses)
 
            forward_url = f"https://graph.microsoft.com/v1.0/users/{target_email}/messages/{latest_email_id}/forward"

            headers = {
                "Authorization": f"Bearer {access_token}",
                "Content-Type": "text/plain",
                'Prefer': 'outlook.timezone="India Standard Time"'
            }

            fwd_response = requests.post(forward_url, headers=headers, data=mime_message)

            if fwd_response.status_code == 202:
                print("Mail sent successfully")
                return True
            else:
                logging.error(f"Failed to send update email. Status code: {reply_response.status_code}")
                logging.error(f"Response content: {reply_response.content}")
                return False

        except Exception as ex:
            logging.error(f"An error occurred: {ex}")
            return False

Result: > Mail triggred for CC and BCC without emial thread. > Receiving mail twice, one is for To address and other is for T0, Cc and BCC addresses

-Your response will be appreciated