ERR_NGROK_27233: ngrok has no catalog entry for "MODELID" on provider "PROVIDERID", so an ngrok-managed key can't serve it - ngrok documentation

What does ERR_NGROK_27233 mean?

ngrok returns ERR_NGROK_27233 with this message:

ngrok has no catalog entry for "<MODELID>" on provider "<PROVIDERID>", so an ngrok-managed key can't serve it. Add your own provider key to use it.

Where can I get more help with ERR_NGROK_27233?

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