Vosk-server and vtt_client.py sample mismatch

I have vosk-server running on a VPS server under Ubuntu 22.04, cloned from https://github.com/alphacep/vosk-server. And I have vtt_client.py running on Windows 10 via WSL2/Ubuntu, cloned from https://github.com/MaxVRAM/vosk_vtt_client.git. Lots of problems getting pyaudio to work but finally got it to run after installing via conda (although vtt_client still thros many ASLA lib errors).

However when I start vosk-server and then vtt_client I get "sampling frequency mismatch, expected 16000, got 8000". I have tried hard coding vosk-server to 8k, and also tried hard coding vtt_client to 16K. Neither of these changed the error message. Also tried running the server with --allow_{upsample,downsample} but this did not help either.

Run out of ideas, are you able to help?