ERR_NGROK_SHIP_PUBLISH_TARGET_BUILTIN_DELETE_NOT_ALLOWED: The built-in publish target cannot be deleted - ngrok documentation

What does ERR_NGROK_SHIP_PUBLISH_TARGET_BUILTIN_DELETE_NOT_ALLOWED mean?

ngrok returns ERR_NGROK_SHIP_PUBLISH_TARGET_BUILTIN_DELETE_NOT_ALLOWED with this message:

The built-in publish target cannot be deleted.

Where can I get more help with ERR_NGROK_SHIP_PUBLISH_TARGET_BUILTIN_DELETE_NOT_ALLOWED?

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