Need help bypassing Azuread Authentication

I had to let a long time employee go recently and need to access the computer he was using (which my company owns of course). Upon opening, I have been directed to a screen showing the HP logo and requesting the Azuread Power-On Authentication password. I naturally have full Admin access if I can get to the usual MS log in prompt. PLEASE HELP as soon as possible. We have been a MS customer for years and have been very satisfied with your products.

I have searched for solutions on the internet and have found nothing that addressed this. Thank you so much in advance.