Why does opening the second link reset the logged in user?

Question

Python

I need that, after registration, the browser goes through a link on the same site and writes something to the chat. The problem is that after going to the second link, the user is no longer authorized. Why is that? What am I doing wrong and how to fix it?

main_url="Ссылка1"
test='Ссылка2'

driver=webdriver.Chrome(executable_path="D:\\")
driver.get(url=main_url)

login_input = driver.find_element_by_id('user_username')
login_input.send_keys('test')

password_input = driver.find_element_by_id('user_password')
password_input.send_keys('1234')

confirmation_registration = driver.find_element_by_xpath('xПатч')
time.sleep(10)

driver.get(url=test)

Answer 1

New session, cookies
What's the idea?