ERR_NGROK_NOTIFICATIONS_SLACK_CHANNEL_JOIN_DENIED: The ngrok app can't join the Slack channel CHANNEL

What does ERR_NGROK_NOTIFICATIONS_SLACK_CHANNEL_JOIN_DENIED mean?

ngrok returns ERR_NGROK_NOTIFICATIONS_SLACK_CHANNEL_JOIN_DENIED with this message:

The ngrok app can't join the Slack channel <CHANNEL>. Reconnect Slack to let the app join public channels.

Troubleshoot ERR_NGROK_NOTIFICATIONS_SLACK_CHANNEL_JOIN_DENIED with your AI agent. Connect it to the ngrok MCP server, then ask what caused the error and how to fix it.

Where can I get more help with ERR_NGROK_NOTIFICATIONS_SLACK_CHANNEL_JOIN_DENIED?

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