> ## Documentation Index
> Fetch the complete documentation index at: https://auth0.com/llms.txt
> Use this file to discover all available pages before exploring further.

> Limitations for migration-specific activities when migrating from Rules & Hooks to Actions

# Actions Migration Limitations

To take advantage of the features provided by Auth0 Actions, you should migrate your current code from Rules, Hooks, or earlier versions of Actions. However, you should be aware of the current limitations when migrating between legacy extensibility offerings and Actions.

## General differences

* Actions can only return `access denied` error codes and does not support returning an `unauthorized` error code.
* Standard claims of an `accessToken` cannot be deleted using an Action.

## Rule specific differences

* The event object in Post Login Actions does not currently provide an alternative for `context.connectionOptions` available within Rules.
* The event object in Post Login Actions does not currently provide an alternative for accessing any token from upstream IdP for federated users through `user.identities` object is available within Rules.
* Standard claims of an `idToken` cannot be deleted using an Action.
* Actions only support modifying the primary user between linked accounts.