Cookies doesn't work in sub services pages

Question

The task is simple. Go to the service https://mail.ru/ Load cookies. Go to the subservice with the same cookies https://x.calendar.mail.ru/

Manually - it works. As soon as they are loaded from a file, when switching to the second service, the cookies are deleted. I don't understand what the problem is?

Code:

import undetected_chromedriver as uc

from selenium import webdriver
import time
import os
import pickle

from utils.navigate import navigate, coockies_load

options=webdriver.ChromeOptions()
driver = uc.Chrome(options=options)


def main():
    navigate(driver, "https://mail.ru/", 20)

    coockies_load(driver)

    navigate(driver, "https://x.calendar.mail.ru/", 5)

if __name__ == '__main__':
    main()

File navigate.py

import os
import time
import pickle
import time

def navigate(driver, url: str, sec: int):
    driver.get(url)
    time.sleep(sec)

def coockies_load(driver):
    if os.path.exists('cookies.pkl'):
        for cookie in pickle.load(open("cookies.pkl", "rb")):
            driver.add_cookie(cookie)
        print('Загрузили файл куки')
        time.sleep(5)
        driver.refresh()
        time.sleep(5)
    else:
        navigate(driver, "https://mail.ru/", 5)
        pickle.dump(driver.get_cookies(), open("cookies.pkl", "wb"))
        print('Сохранили файл куки')
        time.sleep(5)