ERR_NGROK_SHIP_DOMAIN_PROVIDER_RATE_LIMITED: PROVIDER is rate limiting DNS API calls for ZONE - ngrok documentation

What does ERR_NGROK_SHIP_DOMAIN_PROVIDER_RATE_LIMITED mean?

ngrok returns ERR_NGROK_SHIP_DOMAIN_PROVIDER_RATE_LIMITED with this message:

<PROVIDER> is rate limiting DNS API calls for <ZONE>.

Where can I get more help with ERR_NGROK_SHIP_DOMAIN_PROVIDER_RATE_LIMITED?

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