Unable to get focus back on to main window and click on disconnect button

I have the below code

After coming back to main window unable to get focus and disconnect button is not getting clicked

parent_handle = driver.window_handles[0]

#clicks on  link
driver.find_element_by_xpath("//*[@id='content']/div[4]/div/p/a").click()

child_handle = [x for x in driver.window_handles if x != parent_handle][0]
driver.switch_to.window(child_handle)

time.sleep(2)

#will work on this winow

driver.close()

driver.switch_to.window(parent_handle)
time.sleep(30)

#click on Disconnect button on toolbar on main window
driver.find_element_by_xpath("//a[contains(text(), 'btn btn-outline-dark  et-disconnect-link et-disconnect-warning-link')]").click()

I tried several ways but getting the below error

selenium.common.exceptions.NoSuchElementException: Message: no such element: 
Unable to locate element: {"method":"xpath","selector":"//a[contains(text(), 'btn btn-outline-dark  et-disconnect-link et-disconnect-warning-link')]"}
  (Session info: chrome=79.0.3945.117)