Setting up integration fails with API error "Missing required parameter: code"

Checklist

[X] I have verified that the account and device works in the Comfort Cloud App.
[X] This issue only contains 1 issue (if you have multiple issues, open one issue for each issue).
[X] This issue is not a duplicate issue of currently previous issues..

What version of Home Assistant Core?

core-2024.11.1

Describe the issue

Tried to add my heat pump back to Home Assistant after upgrading to integration version 2024.11, after previously encountering the famed 'Precondition Failed'.

I input my login, press Submit, and it loads for a couple seconds before showing a dialog with 'Unexpected error when adding device'. Looking at the logs shows the Panasonic API call is missing a required parameter 'code'.

Let me know if you need any more information, and thank you for all your hard work :)

My installation details

Version             core-2024.11.1
Installation type   Home Assistant Container
Development             false
Supervisor          false
Docker                  true
User                    root
Virtual environment     false
Python version          3.12.4
OS family               Linux
OS version          6.6.47+rpt-rpi-2712
CPU architecture    aarch64
Timezone            Pacific/Auckland
Configuration directory /config

Error/Debug Logs

This error originated from a custom integration.

Logger: custom_components.panasonic_cc.pcomfortcloud.helpers
Source: custom_components/panasonic_cc/pcomfortcloud/helpers.py:27
integration: Panasonic Comfort Cloud (documentation, issues)
First occurred: 13:36:52 (1 occurrences)
Last logged: 13:36:52

Error in get_token Expected status code '200' but received '400' Response body: {"error":"invalid_request","error_description":"Missing required parameter: code"}

sockless-coding / panasonic_cc