Unable to Authenticate Anonymous Access OData Feed/API

Hello, 

I am working to integrate PowerBI with a vendor solution/API (Cornerstone) and I have the following code to enter into the Advanced Editor: 

let
    client_id = "",
    client_secret = "",
    corporation_host = "",
 
    //do not edit section below
    base_url = "https://" & corporation_host & ".csod.com/services/api",
    token_url = base_url & "/oauth2/token",
    odata_url = base_url & "/x/odata/api/views/",
 
    query = [
        clientId = client_id,
        clientSecret = client_secret,
        grantType = "client_credentials",
        scope="all"
        ],
    oauthRequest = Json.FromValue(query),
    Response = Web.Contents(token_url, [
        Content = oauthRequest,
        Headers=[#"Content-type" = "application/json",#"Accept" = "application/json"], ManualStatusHandling = {400}
        ]
    ),
    Parts = Json.Document(Response),
    authToken = if (Record.HasFields(Parts, {"error", "error_description"})) then
                    error Error.Record(Parts[error], Parts[error_description], Parts)
                else
                    "Bearer " & Parts[access_token],
 
    Source=OData.Feed(odata_url,[#"Authorization" = authToken],null),
    //end of do not edit section
    User_View = Source{[Name="vw_rpt_user",Signature="table"]}[Data]
in
    User_View

I have the correct client secret, ID and site host name, and I am experiencing the following errors: 

1) After loading the code into Power Query using the Advanced Editor I get this errror: 

2) When I try to configure anonymous access from data source settings - I am returned with the error that "we couldn't authneticate with the credentials provided. Please try again" 

Am I missing something in my code or did I misconfigure my OAuth client for my data source? I am trying to access a production government instance if that provides any insight in terms of secruity.