Operation returned an invalid status code 'Unauthorized' while connecting Power BI embed app.

I am getting error in the below line while connecting Power BI with embed app.

 

I have give all id's in JSON settings like below.

 

"AzureAd": {
"AuthenticationMode": "ServicePrincipal",
//"AuthorityUrl": "https://login.microsoftonline.com/organizations/",
"AuthorityUrl": "https://login.microsoftonline.com/que8ad7-adsd-w22sf-23iuhsasd",
"ClientId": "fdsguy-erhdj-rtyuiw-32987ud-fdwiu8ds7s",
"TenantId": "8fdf987ad87-dsafi-ytrt5-niuwoiuafm09er9",
"ScopeBase": [ "https://analysis.windows.net/powerbi/api/.default" ],
"PbiUsername": "[email protected]",
"PbiPassword": "************",
"ClientSecret": "fdsgshfgajdad-dafdbvnvfoiepi-3edfsfdshj"
},
"PowerBI": {
"WorkspaceId": "4398dsewwsdfkg-fdijo-hoigu-kjfdj-irkfjfjdsa0w987e",
"ReportId": "fvxcn-cvkbvj-vcxbivc-vcxbj-er9rekjxlj",
"DataSetId": "hfakjfdadaf-adsfljjreuu8-fdld87fsf-fsghfkfs"

 

 

But, still i am getting  below error.

 

Error Details:
Operation returned an invalid status code 'Unauthorized'

at Microsoft.PowerBI.Api.ReportsOperations.GetReportInGroupWithHttpMessagesAsync(Guid groupId, Guid reportId, Dictionary`2 customHeaders, CancellationToken cancellationToken)
at Microsoft.PowerBI.Api.ReportsOperationsExtensions.GetReportInGroupAsync(IReportsOperations operations, Guid groupId, Guid reportId, CancellationToken cancellationToken)
at Microsoft.PowerBI.Api.ReportsOperationsExtensions.GetReportInGroup(IReportsOperations operations, Guid groupId, Guid reportId)
at AppOwnsData.Services.PbiEmbedService.GetEmbedParams(Guid workspaceId, Guid reportId, Guid additionalDatasetId) in C:\Users\PowerBI-Developer-Samples-master\.NET Core\Embed for your customers\AppOwnsData\Services\PbiEmbedService.cs:line 46
at AppOwnsData.Controllers.EmbedInfoController.GetEmbedInfo() in C:\Users\PowerBI-Developer-Samples-master\.NET Core\Embed for your customers\AppOwnsData\Controllers\EmbedInfoController.cs:line 45

 

below is my code

 

public PowerBIClient GetPowerBIClient()
{
var tokenCredentials = new TokenCredentials(aadService.GetAccessToken(), "Bearer");
return new PowerBIClient(new Uri(powerBiApiUrl ), tokenCredentials);
}

 

Error line

*******************

PowerBIClient pbiClient = this.GetPowerBIClient();

// Get report info
var pbiReport = pbiClient.Reports.GetReportInGroup(workspaceId, reportId); ==> Error Line

 

What is the error and how we could solve this....?