Lock working via Google Home

Configuration Voice Assistant
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1

I’m not using HA Cloud, but my own integration. Everything else including my Home Alarm works great.

I’ve recently got a vehicle which has a HA integration, but not Google Home, so I’ve set up a lock device and shared it as follows (this is a small snippet of around 50 devices I have shared)

project_id: homeassistanttalk-123456
service_account: !include SERVICE_ACCOUNT.JSON
secure_devices_pin: "1234"
report_state: true
expose_by_default: false
entity_config:
    lock.ioniq_5_door_lock:
        name: Car Lock
        expose: true
        room: Garage
    alarm_control_panel.home:
        name: Home Security
        expose: true
        room: Living Room
    light.kitchen_main_light:
        name: Kitchen Main
        expose: true
        room: Kitchen

Via the Google Home app on my phone, I click unlock it asks me for the PIN and it works.
Via voice (Google Home devices) I can unlock the device, but when I request to lock it, it asks me for my PIN - I supply my PIN (tried voice and typing) then it says that PIN isn’t correct.

I appreciate this is more of a Google/Google Home issue, but any ideas at all?