To get your IP PIN you can log in to the IRS portal at IRS.gov/IPPIN and click the "Get an IP PIN" button.
When the ID.me login screen appears, it might prompt you to "Sign in with a Passkey." If you have one set up, use your phone’s FaceID, TouchID, or PIN.
If you don't want to use it or don't have one, look for a link that says "Sign in with password instead" or "Try another way."