BadSessionNotActivated,0x80270000,The session cannot be used because ActivateSession has not been called

Whenever I try to send an ActivateSessionRequest to the opcua server, it throws an error stating "BadSessionNotActivated". Below is the message format of ActivateSessionRequest:

  var ActivateSessionRequest v_activateSessionReq := {
  requestHeader := session_reqHeader,

  clientSignature := {
    algorithm := valueof(tr_String("http://opcfoundation.org/UA/SecurityPolicy#None")),
    Signature := valueof(tr_ByteString({48, 130, 4, 19, 48, 130, 2, 251, 160, 3, 2, 1, 2, 2, 2, 16, 26, 48, 13, 6, 9, 42, 134, 72, 134, 247, 13, 1, 1, 11, 5, 0, 48, 40, 49, 18, 48, 16, 6, 3, 85, 4, 10, 19, 9, 78, 111, 100, 101, 79, 80, 67, 85, 65, 49, 18, 48, 16, 6, 3, 85, 4, 3, 19, 9, 78, 111, 100, 101, 79, 80, 67, 85, 65, 48, 34, 24, 15, 50, 48, 49, 56, 48, 50, 48, 53, 49, 51, 53, 54, 48, 50, 90, 24, 15, 50, 48, 49, 57, 48, 50, 48, 53, 49, 51, 53, 54, 48, 50, 90, 48, 40, 49, 18, 48, 16, 6, 3, 85, 4, 10, 19, 9, 78, 111, 100, 101, 79, 80, 67, 85, 65, 49, 18, 48, 16, 6, 3, 85, 4, 3, 19, 9, 78, 111, 100, 101, 79, 80, 67, 85, 65, 48, 130, 1, 34, 48, 13, 6, 9, 42, 134, 72, 134, 247, 13, 1, 1, 1, 5, 0, 3, 130, 1, 15, 0, 48, 130, 1, 10, 2, 130, 1, 1, 0, 178, 243, 137, 233, 196, 81, 105, 65, 195, 121, 2, 212, 193, 216, 187, 73, 213, 135, 135, 163, 140, 13, 165, 74, 203, 63, 212, 221, 158, 178, 59, 89, 71, 118, 141, 147, 102, 111, 5, 111, 52, 36, 160, 187, 189, 244, 38, 0, 200, 206, 33, 174, 227, 110, 132, 79, 202, 59, 223, 29, 116, 217, 12, 193, 191, 44, 87, 168, 113, 69, 125, 23, 239, 71, 139, 38, 121, 203, 255, 54, 196, 68, 199, 249, 43, 206, 32, 255, 192, 10, 134, 200, 71, 104, 150, 176, 66, 233, 241, 17, 227, 3, 96, 172, 169, 164, 96, 113, 114, 190, 194, 28, 232, 161, 46, 241, 170, 0, 70, 215, 89, 228, 130, 219, 152, 216, 85, 234, 72, 142, 103, 63, 211, 101, 238, 224, 160, 84, 134, 171, 241, 148, 60, 212, 190, 250, 16, 203, 248, 212, 153, 16, 56, 159, 153, 185, 202, 239, 135, 150, 185, 188, 80, 207, 62, 122, 172, 25, 110, 80, 124, 166, 227, 86, 32, 97, 137, 35, 164, 156, 1, 150, 51, 64, 140, 180, 196, 162, 32, 131, 207, 170, 144, 19, 90, 251, 239, 173, 33, 65, 135, 125, 110, 137, 2, 184, 106, 146, 55, 166, 217, 141, 127, 163, 137, 57, 91, 158, 133, 29, 218, 205, 174, 98, 208, 123, 30, 240, 42, 29, 102, 187, 113, 26, 166, 30, 55, 207, 49, 32, 132, 173, 115, 155, 7, 207, 206, 201, 27, 209, 52, 198, 119, 210, 142, 161, 2, 3, 1, 0, 1, 163, 130, 1, 65, 48, 130, 1, 61, 48, 12, 6, 3, 85, 29, 19, 1, 1, 255, 4, 2, 48, 0, 48, 29, 6, 3, 85, 29, 14, 4, 22, 4, 20, 162, 197, 27, 92, 111, 157, 37, 181, 146, 213, 162, 250, 174, 112, 194, 229, 164, 3, 176, 205, 48, 81, 6, 3, 85, 29, 35, 4, 74, 48, 72, 128, 20, 162, 197, 27, 92, 111, 157, 37, 181, 146, 213, 162, 250, 174, 112, 194, 229, 164, 3, 176, 205, 161, 44, 164, 42, 48, 40, 49, 18, 48, 16, 6, 3, 85, 4, 10, 19, 9, 78, 111, 100, 101, 79, 80, 67, 85, 65, 49, 18, 48, 16, 6, 3, 85, 4, 3, 19, 9, 78, 111, 100, 101, 79, 80, 67, 85, 65, 130, 2, 16, 26, 48, 91, 6, 3, 85, 29, 17, 4, 84, 48, 82, 134, 44, 117, 114, 110, 58, 97, 118, 100, 111, 111, 116, 99, 104, 97, 108, 107, 101, 45, 86, 105, 114, 116, 117, 97, 108, 66, 111, 120, 58, 78, 111, 100, 101, 79, 80, 67, 85, 65, 45, 83, 101, 114, 118, 101, 114, 130, 9, 108, 111, 99, 97, 108, 104, 111, 115, 116, 130, 23, 97, 118, 100, 111, 111, 116, 99, 104, 97, 108, 107, 101, 45, 86, 105, 114, 116, 117, 97, 108, 66, 111, 120, 48, 44, 6, 9, 96, 134, 72, 1, 134, 248, 66, 1, 13, 4, 31, 22, 29, 79, 112, 101, 110, 83, 83, 76, 32, 71, 101, 110, 101, 114, 97, 116, 101, 100, 32, 67, 101, 114, 116, 105, 102, 105, 99, 97, 116, 101, 48, 14, 6, 3, 85, 29, 15, 1, 1, 255, 4, 4, 3, 2, 2, 252, 48, 32, 6, 3, 85, 29, 37, 1, 1, 255, 4, 22, 48, 20, 6, 8, 43, 6, 1, 5, 5, 7, 3, 1, 6, 8, 43, 6, 1, 5, 5, 7, 3, 2, 48, 13, 6, 9, 42, 134, 72, 134, 247, 13, 1, 1, 11, 5, 0, 3, 130, 1, 1, 0, 147, 168, 16, 170, 204, 221, 81, 100, 167, 38, 104, 142, 27, 107, 108, 87, 94, 195, 100, 124, 141, 117, 46, 23, 231, 145, 68, 182, 241, 225, 148, 94, 144, 1, 142, 61, 228, 88, 64, 243, 126, 180, 17, 33, 164, 128, 234, 183, 198, 31, 223, 59, 125, 218, 110, 0, 112, 182, 244, 199, 220, 139, 114, 162, 153, 76, 245, 134, 167, 163, 199, 175, 153, 82, 214, 106, 142, 15, 52, 87, 11, 230, 95, 75, 23, 170, 137, 92, 144, 76, 111, 179, 1, 36, 150, 191, 84, 226, 252, 199, 228, 38, 97, 138, 26, 32, 230, 65, 110, 154, 179, 104, 146, 186, 104, 248, 246, 26, 136, 12, 15, 220, 6, 203, 220, 141, 230, 11, 185, 247, 250, 9, 76, 236, 74, 101, 149, 32, 100, 220, 249, 46, 255, 129, 21, 126, 6, 86, 230, 198, 94, 228, 51, 50, 73, 103, 57, 212, 105, 255, 9, 181, 189, 104, 121, 27, 21, 78, 196, 226, 99, 176, 44, 194, 176, 211, 216, 13, 81, 142, 35, 52, 76, 116, 49, 190, 253, 199, 166, 51, 41, 105, 81, 90, 222, 232, 223, 74, 100, 203, 192, 130, 48, 46, 116, 37, 236, 199, 70, 81, 60, 244, 6, 45, 51, 246, 4, 254, 178, 240, 14, 22, 64, 200, 134, 199, 249, 171, 118, 219, 81, 124, 218, 91, 175, 65, 59, 233, 19, 110, 217, 72, 165, 91, 75, 182, 12, 214, 215, 30, 169, 153, 36, 7, 69, 60  ,224, 153, 75, 106, 120, 118, 227, 63, 4, 63, 14, 101, 116, 161, 229, 230, 127, 196, 14, 37, 23, 251, 174, 94, 204, 114, 180, 26, 77, 200, 61, 148}))         
    },

  clientSoftwareCertificates := { realArray := { arrayLength := 0, arrayValues := { } } },

  localeIds := valueof(tr_ListOfLocaleId({})),

  userIdentityToken := {
    encodingByte := 1,
    twoByteNodeValue := omit,
    namespaceIndex := 0,
    fourByteNodeValue := 321,
    encoding := 1,
    parameterLength := 13,
    extensibleParameterBody := {
      anonymousIdentityToken := {
        policyId := valueof(tr_String( "username_basic256"))
      }
    }
  },

  userTokenSignature := {
    algorithm := valueof(tr_StringNull),
    Signature := valueof(tr_ByteStringNull)
  }
}

Client-Server Communication As shown in the image, ActivateSessionRequest is successful by sending SessionId and AuthenticationToken to the server. The header of ActivateSessionRequest contains AuthenticationToken. But How shall I provide the SessionId to the server? Is it because I am not providing the SessionId in the ActivateSessionRequest that the server throws an error or due to some other mistake? can someone guide me?

Any feedback is highly appreciated. Thank you in Advance

With Regards,

Avdoot