Anyone know how to get puk code for I phone 12 pro max

See this Apple article: Use a SIM PIN for your iPhone or iPad

Use a SIM PIN for your iPhone or iPad - Apple Support

Every SIM card holder of a carrier has the corresponding PUK code.

If you still have the SIM card holder . . . . take a look.

By contacting your cellular carrier. They should have your PIN & PUK codes.

Regards

Giulio