How to enter data to IWA fields via Playwright

I need to automate a test that uses IWA (Integrated Windows Authentication).

I know that the the prompt that opens up is not part of the HTML page, yet why my code is not working:

login_page.click_iwa()
sleep(5)
self.page.keyboard.type('UserName')
sleep(5)
self.page.keyboard.press('Tab')
self.page.keyboard.type('Password')

from How to enter data to IWA fields via Playwright