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

# Authentication

> Learn how to authenticate with the Infisical Public API.

You can authenticate with the Infisical API using [Identities](/documentation/platform/identities/machine-identities) paired with authentication modes such as [Universal Auth](/documentation/platform/identities/universal-auth).

To interact with the Infisical API, you will need to obtain an access token. Follow the step by [step guide](/documentation/platform/identities/universal-auth) to get an access token via Universal Auth.

**FAQ**

<AccordionGroup>
  <Accordion title="Why can I not create, read, update, or delete an identity?">
    There are a few reasons for why this might happen:

    * You have insufficient organization permissions to create, read, update, delete identities.
    * The identity you are trying to read, update, or delete is more privileged than yourself.
    * The role you are trying to create an identity for or update an identity to is more privileged than yours.
  </Accordion>

  <Accordion title="Why is the Infisical API rejecting my identity credentials?">
    There are a few reasons for why this might happen:

    * The client secret or access token has expired.
    * The identity is insufficiently permissioned to interact with the resources you wish to access.
    * You are attempting to access a `/raw` secrets endpoint that requires your project to disable E2EE.
    * The client secret/access token is being used from an untrusted IP.
  </Accordion>
</AccordionGroup>