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I got the confirmation Email regarding whitelisting of project and tried inserting a Goal but got the error.
{The service analytics has thrown an exception: Google.GoogleApiException: Google.Apis.Requests.RequestError
Your project does not have access to this feature. [403]
Errors [
        Message[Your project does not have access to this feature.] Location[ - ] Reason[insufficientPermissions] Domain[global]
]

   at Google.Apis.Requests.ClientServiceRequest`1.<ParseResponse>d__34.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Google.Apis.Requests.ClientServiceRequest`1.Execute()}
   

I'm using the Google.Apis.Analytics.v3 (1.32) nuget package for creating the goal

The code I've written is:

                var goal = new Goal();
                goal.AccountId = accId;
                goal.WebPropertyId = websiteId;
                goal.ProfileId = profileId;
               
                goal.Name = "Api Funnel";
                goal.Active = true;
                goal.Created = new DateTime();

               
                goal.Type = "URL_DESTINATION";
                var urlDestinationDetails = new UrlDestinationDetailsData();
                urlDestinationDetails.MatchType = "EXACT";

                var stepData0 = new UrlDestinationDetailsData.StepsData();
                stepData0.Number = 0;
                stepData0.Url = "step1";
                stepData0.Name = "Step1";

                var stepData1 = new UrlDestinationDetailsData.StepsData();
                stepData1.Number = 0;
                stepData1.Url = "step2";
                stepData1.Name = "Step2";

                var steps = new List<UrlDestinationDetailsData.StepsData>();

                urlDestinationDetails.Steps = steps;
                goal.UrlDestinationDetails = urlDestinationDetails;
                goal.UrlDestinationDetails.Url = "step2";
                var request = analyticsService.Management.Goals.Insert(goal, accId, websiteId, profileId);
                request.Execute();


I've also added a screenshot of developer console that states that the request made to the API was returned with a 403 response status.