> ## 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 637

## ERR\_NGROK\_637

This credential cannot be deleted because it is the default authtoken tied to `EMAIL`. Removing the user from this account will also delete any associated tokens.

Credential ID: `ID`
Description: `DESCRIPTION`

## 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_637)