The PIN google assistant is asking for is different than the one you use
on the keypad of your door lock. See the details of how to find the PIN
you need for google assistant in my reply.
The PIN code used for unlocking your Philips smart lock via Google
Assistant is managed within the Philips Home Access app (or the relevant
Philips smart lock control app). You can find and manage these PINs by
navigating to:Open the Philips Home Acc...