Samsung Smartthings integration error

Hi i am trying to integrate samsung smart things but I am getting an error after I enter the personal access token as seen in the image. This is the first time setting it up. i am using cloudflare tunnels to provide access

When looking at the logs I can see this error is showing:
Any help will be much appreciated.

Logger: homeassistant.components.smartthings.config_flow
Source: components/smartthings/config_flow.py:135
integration: SmartThings (documentation, issues)
First occurred: 30 September 2024 at 10:39:31 (2 occurrences)
Last logged: 08:34:30

API error setting up the SmartApp: {'requestId': '436845564110555972', 'error': {'code': 'ConstraintViolationError', 'message': 'The request is malformed.', 'details': [{'code': 'TargetTimeoutError', 'target': 'https://homeassistant************.co.uk/api/webhook/40519c90f0e95eb453e593a48ae21c3d10d5ab10688b1d6054cbb5e53b8de0c8', 'message': 'Upstream target timed out', 'details': []}]}}
API error setting up the SmartApp: {'requestId': '2494646337062748583', 'error': {'code': 'ConstraintViolationError', 'message': 'The request is malformed.', 'details': [{'code': 'TargetTimeoutError', 'target': 'https://homeassistant************.co.uk/api/webhook/e2ff1334e44d90233eddc0a998be7c137ea90b5393e023791761d639d0a6709e', 'message': 'Upstream target timed out', 'details': []}]}}
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/smartthings/config_flow.py", line 135, in async_step_pat
    app, client = await create_app(self.hass, self.api)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/smartthings/smartapp.py", line 146, in create_app
    app, client = await api.create_app(app)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pysmartthings/smartthings.py", line 110, in create_app
    entity = await self._service.create_app(app.to_data())
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pysmartthings/api.py", line 171, in create_app
    return await self.post(API_APPS, data)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pysmartthings/api.py", line 395, in post
    return await self.request("post", self._api_base + resource, data=data)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pysmartthings/api.py", line 368, in request
    raise APIResponseError(
pysmartthings.errors.APIResponseError: Unprocessable Entity (422): {"requestId": "436845564110555972", "error": {"code": "ConstraintViolationError", "message": "The request is malformed.", "details": [{"code": "TargetTimeoutError", "target": "https://homeassistant************.co.uk/api/webhook/40519c90f0e95eb453e593a48ae21c3d10d5ab10688b1d6054cbb5e53b8de0c8", "message": "Upstream target timed out", "details": []}]}}