Sending json file to slack chat does not work (via python script), what could be wrong?

Question

Python

import nmap
import requests
import json
import os 
os.remove("result.json")


def my_scanner(host, port_range):
    scan_dict = {}
    nmScan = nmap.PortScanner()
    nmScan.scan(host, port_range)
    for host in nmScan.all_hosts():
        #scan_dict['ip'] = ip
        scan_dict['Host'] = host 
        #scan_dict['host_name'] =  nmScan[host].hostname()
        scan_dict['State'] = nmScan[host].state()
                
        for proto in nmScan[host].all_protocols():
            scan_dict[proto] = {}

            lport = nmScan[host][proto].keys()
            sorted(lport)
            for port in lport:
                scan_dict[proto][port] = nmScan[host][proto][port]['state']
        
    json_object = json.dumps(scan_dict)

    # Writing to sample.json
    with open("result.json", "a") as outfile:
        outfile.write(json_object)
    return 

ip_list = ['127.0.0.1','127.0.0.1']

port_range_list = ['21-22']

for host in ip_list:
    print(my_scanner(host,'21-22'))

my_file = {
  'file' : ('/home/user/any_dir/result.json', open('/home/user/any_dir/result.json', 'rb'), 'json')
}

payload={
  "filename":"result.json", 
  "token":"https://hooks.slack.com/services/**************/**************/**************", 
  "channels":['#1'],
}

r = requests.post("https://hooks.slack.com/services/******************/****************/****************", params=payload, files=my_file)

I can’t understand what’s the matter, I created a bot in Slack, I also attached the token. Kurl messages are sent to the desired chat.
The script itself is working. Any ideas?