ERR_NGROK_3151: PROVIDER rejected use of your session's OAuth token: "ERROR"

What does ERR_NGROK_3151 mean?

ngrok returns ERR_NGROK_3151 with this message:

<PROVIDER> rejected use of your session's OAuth token: "<ERROR>". Your session is invalid and cannot continue.

Troubleshoot ERR_NGROK_3151 with your AI agent. Connect it to the ngrok MCP server, then ask what caused the error and how to fix it.

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