ERR_NGROK_SHIP_POOL_KIND_NOT_CONFIGURED: Pool kind KIND is not available in this environment - ngrok documentation

What does ERR_NGROK_SHIP_POOL_KIND_NOT_CONFIGURED mean?

ngrok returns ERR_NGROK_SHIP_POOL_KIND_NOT_CONFIGURED with this message:

Pool kind <KIND> is not available in this environment.

Where can I get more help with ERR_NGROK_SHIP_POOL_KIND_NOT_CONFIGURED?

Email support@ngrok.com and include the error code.