Azure Subscription Cost Sensor - Could not authenticate with AzureAD

Hi. I realise this sensor has just been realised and is still in beta, however was wondering if anyway else was having problems getting it working?

I have followed all the instructions in the following articles, and checked twice. I am happy I setup all the correct tenant, subscription and client ID's and also the correct client secret;

https://www.paessler.com/manuals/prtg/microsoft_azure_subscription_cost_sensor https://kb.paessler.com/en/topic/88625-how-do-i-obtain-credentials-and-create-custom-roles-for-the-microsoft-azure-sensors

Have tried on both our corporate network and on a standalone install directly connected to the Internet - so don't thing this is a problem with our corporate network, firewalls etc.

The sensor returns the error "The sensor could not authenticate with Azure AD. Check your credentials in the device settings or look into the sensor log for more details."

Here is a dump of sensor log;

2020-12-22 11:45:39.362268 DEBG TId    5856 Result of Sensor 14236> Response Message is: #:error.authentication_failed
2020-12-22 11:45:39.362268 DEBG TId    5856 Result of Sensor 14236> #################### Exit sensor scan  ####################
2020-12-22 11:45:41.159167 DEBG TId   13600 Result of Sensor 14236> #################### Enter sensor scan ####################
2020-12-22 11:45:41.502925 DEBG TId   13600 Result of Sensor 14236> Authentication failed: ChilkatLog:

  ObtainAccessToken:

    DllDate: Jul 24 2019

    ChilkatVersion: 9.5.0.79

    ogging: 0

    sendReqFormUrlEncoded:

      sendReqHeader:

        omitContentType: 0

        sendReqHeader2:

          checkEstablishConnection:

            The connection already exists, as far as we know..

          --checkEstablishConnection

        --sendReqHeader2

      --sendReqHeader

    --sendReqFormUrlEncoded

    responseStatusCode: 401

    responseCode: 401

    non-success response status code.

    Failed.

  --ObtainAccessToken

--ChilkatLog


2020-12-22 11:45:41.502925 DEBG TId   13600 Result of Sensor 14236> Response Message is: #:error.authentication_failed
2020-12-22 11:45:41.502925 DEBG TId   13600 Result of Sensor 14236> #################### Exit sensor scan  ####################

Many thanks.

azure cost prtg