How to embed pbix which is connected to redshift?

I am  new user of PowerBI trying to embed reports on web-app using this sample code https://github.com/Azure-Samples/power-bi-embedded-integrate-report-into-web-app/

I was able to succesfully create pbix file using PowerBI desktop, and create workspace. But when I follow step 7 "update connection string info for existing dataset" and provide jdbc or odbc connection string provided by AWS redshift which looks like this Driver={Amazon Redshift (x64)}; Server=servername.cecf14nmvqna.us-west-2.redshift.amazonaws.com; Database=dbname; UID=username; PWD=password; Port=5439

I am getting following exception

Ooops, something broke: Microsoft.Rest.HttpOperationException: Operation returned an invalid status code 'BadRequest'
at Microsoft.PowerBI.Api.V1.Datasets.<SetAllConnectionsWithHttpMessagesAsync>d__15.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.PowerBI.Api.V1.DatasetsExtensions.<SetAllConnectionsAsync>d__21.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at ProvisionSample.Program.<UpdateConnection>d__27.MoveNext() in C:\Users\username\Desktop\power-bi-embedded-integrate-report-into-web-app-master\ProvisionSample\Program.cs:line 592
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at ProvisionSample.Program.<Run>d__17.MoveNext() in C:\Users\ruchit\Desktop\power-bi-embedded-integrate-report-into-web-app-master\ProvisionSample\Program.cs:line 235

Does anyone know what might be wrong here?