> ## 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 1966

## ERR\_NGROK\_1966

The certificate `ID` could not be deleted because it has an attached Managed Certificate Policy. If this certificate is automatically generated, delete the domain reservation or use a different certificate type.

## 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_1966)