Azure Service Bus - Unauthorized access. 'Send' claim(s) are required to perform this operation

I am trying to access Azure Service Bus Queue from my Windows Service application. I am following this sample.

I want to protect this Azure Service Bus using Azure Service Principal Below are the steps I have implemented

1. Register an application named pc-shutdown-producer in Azure Ad representing my Windows Service
2. I have created my Azure service bus namespace named shutdowncomputer
3. Inside Access control (IAM), I have added Role Assignment with below values
   • Role - Azure Service Bus Data Owner
   • Assign access to - pc-shutdown-producer

As per my knowledge above configuration will let pc-shutdown-producer application to manage all the resources in the servicebus namespace. 4. Apart from this, I have also provided pc-shutdown-producer delegated API Permissions to access the service bus namespace.

Below is my C# code.

        public async Task Init()
        {
            string authority = $"https://login.windows.net/{TenantId}";

            ITokenProvider tokenProvider = TokenProvider.CreateAzureActiveDirectoryTokenProvider(AuthenticationCallback, authority);
            var endpoint = new Uri($"sb://shutdowncomputer.servicebus.windows.net/");
            var entityPath = "shutdownrequest";

            var qc = new QueueClient(endpoint.ToString(), entityPath, tokenProvider);

            Message m = new Message();
            m.Body = Encoding.ASCII.GetBytes("{id: 1, name: 'hemant'}");
            m.ContentType = "application/json";
            try
            {
                await qc.SendAsync(m);
            }
            catch (Exception ex)
            {
                //I am getting exception here. 
                //Unauthorized access. 'Send' claim(s) are required to perform this operation.
                throw ex;
            }
        }

        private async Task<string> AuthenticationCallback(string audience, string authority, object state)
        {
            string accessToken = string.Empty;
            IConfidentialClientApplication app = ConfidentialClientApplicationBuilder.Create(AppId)
                .WithAuthority(authority)
                .WithClientSecret(Password)
                .Build();

            var serviceBusAudience = new Uri("https://servicebus.azure.net");

            List<string> claims = new List<string>();
            claims.Add($"{serviceBusAudience}/.default");
            try
            {
                var result = await app.AcquireTokenForClient(claims.ToArray()).ExecuteAsync();
                accessToken = result.AccessToken;
            }
            catch (Exception ex)
            {
                //No issue here.
                Console.WriteLine(ex.Message);
            }
            //Successfully able to retrieve a token.
            return accessToken ;
        }

Upon executing Init() , I am getting below exception message.

Unauthorized access. 'Send' claim(s) are required to perform this operation. Resource: 'sb://shutdowncomputer.servicebus.windows.net/shutdownrequest'. TrackingId:52c0eedcf19d4513a8ec105943859764_G12, SystemTracker:gateway7, Timestamp:2020-05-11T06:59:01

UPDATE 1

As per @Carl Zhao sugession, I have provided admin consent to pc-shutdown-producer but still having same issue.

Thanks