ERR_NGROK_SHIP_DOMAIN_PROVIDER_ACCESS_DENIED: PROVIDER refused the integration's credential for ZONE (HTTP STATUS) - ngrok documentation

What does ERR_NGROK_SHIP_DOMAIN_PROVIDER_ACCESS_DENIED mean?

ngrok returns ERR_NGROK_SHIP_DOMAIN_PROVIDER_ACCESS_DENIED with this message:

<PROVIDER> refused the integration's credential for <ZONE> (HTTP <STATUS>). Check the API key's permissions.

Where can I get more help with ERR_NGROK_SHIP_DOMAIN_PROVIDER_ACCESS_DENIED?

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