public async Task <string> GetToken()
{
this.App = ConfidentialClientApplicationBuilder.Create(this.ClientID)
.WithClientSecret(this.ClientSecret)
.WithAuthority(new Uri(this.Authority))
.Build();
this.ResourceIds = new string[] { this.ResourceID };
this.Result = await App.AcquireTokenForClient(this.ResourceIds).ExecuteAsync();
this.AzureADAccessToken = this.Result.AccessToken;
return(this.AzureADAccessToken);
}