> ## Documentation Index
> Fetch the complete documentation index at: https://ngrok.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Error ERR_NGROK_SHIP_CONTINUOUS_DELIVERY_PREVIEW_TRACKING_REF_NOT_ALLOWED

## ERR\_NGROK\_SHIP\_CONTINUOUS\_DELIVERY\_PREVIEW\_TRACKING\_REF\_NOT\_ALLOWED

A pull request preview tracks its pull request's branch. The 'tracking\_ref' field cannot change.

## Further help

If you're having trouble resolving this error, please reach out to [support@ngrok.com](mailto:support@ngrok.com?subject=Help%20with%20ERR_NGROK_SHIP_CONTINUOUS_DELIVERY_PREVIEW_TRACKING_REF_NOT_ALLOWED)


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