ERR_NGROK_SHIP_POOL_LAMBDA_SSH_KEY_CREATE_UNAVAILABLE: Lambda Cloud did not answer the request to create the SSH key: REASON - ngrok documentation

What does ERR_NGROK_SHIP_POOL_LAMBDA_SSH_KEY_CREATE_UNAVAILABLE mean?

ngrok returns ERR_NGROK_SHIP_POOL_LAMBDA_SSH_KEY_CREATE_UNAVAILABLE with this message:

Lambda Cloud did not answer the request to create the SSH key: <REASON>

Where can I get more help with ERR_NGROK_SHIP_POOL_LAMBDA_SSH_KEY_CREATE_UNAVAILABLE?

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