Transmit SDK returns no audio

Issue I set up the Transmit SDK to send audio samples. TransmitInstance::PushAudio(). inPushAudio->inNumSamples; returns zero samples. mAudioBuffers has no samples.

Adobe Premiere Pro version number version 42.1.0 (build 85)

Operating system Windows 11 version 23H2

System Info: CPU, GPU, RAM, HD:

• CPU 13th Gen Intel(R) Core(TM) i7-13700F 2.10 GHz

• GPU and Driver Version  NVIDIA GeForce RTX 4070  Driver Version: 546.17

• RAM 16.0 GB (15.7 GB usable)

• Hard Drive 951 GB 

Video format: YUYV 422

Workflow details: Transmitter SDK PPro prerelease SDK version 24.0 April 25 2023 Build and run. 

• Steps to reproduce - (Very important!) Exact steps, in a numbered list, that are needed to reproduce the problem. 
• Install Pre-release SDK from Bruce Bullis
• set environment for Premiere version
• replace TransmitterPlugin.cpp with the one attached.
• Visual Studio 2022 open Transmitter sample 
• set environment $(PREMSDKBUILDPATH)\ to proper C:\Program Files\Adobe\Common\Plug-ins\7.0\MediaCore
• Build the Transmitter sample (admin priv.) with the attached TransmitterPlug-in.cpp
• set Project->Properties->Debugging Command to Premiere Pro path
• Set a break point line 594 just after csSDK_uint32 inNumSamples = inPushAudio->inNumSamples;
• Launch debugger which launches Premiere
• enable Transmitter in menu Premiere->Edit->Preferences->Playback audio and video
• Play your project and look at break point
• note that csSDK_uint32 inNumSamples = inPushAudio->inNumSamples; is zero samples

Expected result  inNumSamples should be non-zero and mAudioBuffers should have data

Actual result  inNumSamples is zero and mAudioBuffers has no data