Microsoft Login Credentials

[KingDumb]

I am looking to create an app that would allow someone to sign and submit a form.  However, I need the user to validate their signature by logging in again with their Microsoft Office credentials.  I'm familiar with the pen input and setting passwords in power apps, but I have no idea how to make it work with someone's Microsoft Office credentials.  Is this something that can be done with Power Apps? If so, how would I go about setting it up?

Thank you for any and all help.