InvalidTokenException: Unauthorized-401

I am converting a application to use IPP .net API V3. I have already built all the OAuth and saved the token info. Trying to make connection but always get error. I have checked and recheck all the token data and it appears correct. Where did I go wrong? I am using the DevDefined for OAuth and Intuit.Ipp from NuGet (IPP API V3). I am using my test customer token info but noticed the base URL (from the IPP library) is https://quickbooks.api.intuit.com/. Should that still work?

        Dim accessToken As String = QBOE.GetOAuthItem(Profile.Common.StoreNum, "accessToken")
    Dim accessTokenSecret As String = QBOE.GetOAuthItem(Profile.Common.StoreNum, "accessTokenSecret")
    Dim consumerKey As String = ConfigurationManager.AppSettings("consumerKey")
    Dim consumerSecret As String = ConfigurationManager.AppSettings("consumerSecret")
    Dim oauthValidator As OAuthRequestValidator = New OAuthRequestValidator(accessToken, accessTokenSecret, consumerKey, consumerSecret)

    Dim CompanyID As String = QBOE.GetOAuthItem(Profile.Common.StoreNum, "CompanyID")
    Dim appToken As String = ConfigurationManager.AppSettings("applicationToken")
    Dim context As ServiceContext = New ServiceContext(appToken, CompanyID, IntuitServicesType.QBO, oauthValidator)

    Dim service As DataService = New DataService(context)

    Dim customer As Customer = New Customer()
    'Mandatory Fields
    customer.GivenName = "Mary"
    customer.Title = "Ms."
    customer.MiddleName = "Jayne"
    customer.FamilyName = "Cooper"

    Dim resultCustomer As Customer = TryCast(service.Add(customer), Customer)

Error Message (errors on service.Add) Intuit.Ipp.Exception.InvalidTokenException was unhandled by user code

I checked the calls within fiddler2 and noticed the calls for my OAuth is going through workplace.intuit.com:443 but the IPP calls go through quickbooks.api.intuit.com:443. I also noticed fiddler2 list the IPP call with a Result of 200. Output shown below.

HeaderText: CONNECT quickbooks.api.intuit.com:443 HTTP/1.1 Host: quickbooks.api.intuit.com Proxy-Connection: Keep-Alive

The data sent represents an SSLv3-compatible ClientHello handshake. For your convenience, the data is extracted below.

Major Version: 3 Minor Version: 1 Random: 53 2E 7C 6E A1 F4 02 4D 9D CF 60 C8 22 CA BC E8 67 6E D8 52 88 54 6F E7 D9 29 52 58 5C 2F 2E 52 SessionID: 9E 01 CB DB D6 C8 78 8D D0 E9 A6 5F 02 1E 2C 6D 5D 69 34 FE FD 3E A5 52 EE 19 07 E7 D9 D6 E5 30 Ciphers: [002F] TLS_RSA_AES_128_SHA [0035] TLS_RSA_AES_256_SHA [0005] SSL_RSA_WITH_RC4_128_SHA [000A] SSL_RSA_WITH_3DES_EDE_SHA [C013] TLS1_CK_ECDHE_RSA_WITH_AES_128_CBC_SHA [C014] TLS1_CK_ECDHE_RSA_WITH_AES_256_CBC_SHA [C009] TLS1_CK_ECDHE_ECDSA_WITH_AES_128_CBC_SHA [C00A] TLS1_CK_ECDHE_ECDSA_WITH_AES_256_CBC_SHA [0032] TLS_DHE_DSS_WITH_AES_128_SHA [0038] TLS_DHE_DSS_WITH_AES_256_SHA [0013] SSL_DHE_DSS_WITH_3DES_EDE_SHA [0004] SSL_RSA_WITH_RC4_128_MD5

Reply Text: HTTP/1.1 200 Blind-Connection Established FiddlerGateway: Direct StartTime: 01:17:18.298 EndTime: 01:17:18.536

This is a CONNECT tunnel, through which encrypted HTTPS traffic flows. To view the encrypted sessions inside this tunnel, ensure that the Tools > Fiddler Options > HTTPS > Decrypt HTTPS traffic option is checked.

The data sent represents an SSLv3-compatible ServerHello handshake. For your convenience, the data is extracted below.

Major Version: 3 Minor Version: 1 SessionID: 9E 01 CB DB D6 C8 78 8D D0 E9 A6 5F 02 1E 2C 6D 5D 69 34 FE FD 3E A5 52 EE 19 07 E7 D9 D6 E5 30 Random: 63 E2 D0 B1 09 45 E0 28 A4 3B 0B C2 E8 5F 08 F0 D5 F5 8E A7 47 D4 10 E2 D4 D7 5B C4 74 0B 4B E2 Cipher: 0x05

You can try this call as mentioned in the following docs using IPP provided .net devkit.

https://developer.intuit.com/docs/0025_quickbooksapi/0055_devkits/0150_ipp_.net_devkit_3.0/0002_synchronous_calls/0001_data_service_apis

401 clearly signifies that your OAuth tokens/request header is not correct. To debug this, you can use any standard RestClients ( like RestClient plugins of Mozilla browser or Fiddler) where you can set four OAuth tokens [ consumer key, consumer Secret, access Key and access token) and content-type [application/xml]

URI: https://quickbooks.api.intuit.com/v3/company//customer
Method: POST
Content-Type: application/xml

Mozilla RestClient -

Set OAuth Tokens