Building

mkdir build
cd build
cmake ..
cmake --build . --config Debug
cmake --build . --config Release

Registering engine (run as Administrator)

regsvr32.exe pysapittsengine.dll

Registering voice (run as Administrator)

regvoice.exe --token PYTTS-AzureNeural --name "Azure Neural" --vendor Microsoft --path C:\Work\SAPI-POC;C:\Work\build\venv\Lib\site-packages --module voices --class AzureNeuralVoice