ERR_NGROK_SHIP_CHATBOT_ENTITLEMENT_DENIED: Your plan doesn't include the ngrok chat agent - ngrok documentation

What does ERR_NGROK_SHIP_CHATBOT_ENTITLEMENT_DENIED mean?

ngrok returns ERR_NGROK_SHIP_CHATBOT_ENTITLEMENT_DENIED with this message:

Your plan doesn't include the ngrok chat agent. Upgrade to connect a Slack workspace.

Where can I get more help with ERR_NGROK_SHIP_CHATBOT_ENTITLEMENT_DENIED?

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