ERR_NGROK_SHIP_ENVIRONMENT_POOL_ID_INVALID: The pool_id VALUE in 'pools' is not a pool ID: REASON - ngrok documentation

What does ERR_NGROK_SHIP_ENVIRONMENT_POOL_ID_INVALID mean?

ngrok returns ERR_NGROK_SHIP_ENVIRONMENT_POOL_ID_INVALID with this message:

The pool_id <VALUE> in 'pools' is not a pool ID: <REASON>

Where can I get more help with ERR_NGROK_SHIP_ENVIRONMENT_POOL_ID_INVALID?

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