Client Credentials Based Authentication - Invalid Client Secret - Appian SharePoint Integration

Hi,

We have a use case to upload the documents stored in Appian to the SharePoint folder. 

We don't want each user to provide the SharePoint credentials every time a document is attempted to move to the Sharepoint site. Hence, we want to establish the Connected System on Appian via the "Client Credentials" approach. However, the instructions on the link shown below this in the Connected System box is not clear on how to generate the "Client Secret". The steps documented to generate Client Secret on https://docs.appian.com/suite/help/21.4/Integrating_Sharepoint_with_Appian_CS.html is followed, but on the Connected System when selected "Client Credentials" as Authentication, Appian is throwing the error: Unable to retrieve access token The following error occurred: Invalid Client Secret Please ensure that your Client Secret in the connected system is correct. (Refer screenshot). Any thoughts on how to generate client secret key on SharePoint site for Client Credentials based authentication.