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

> ## Agent Instructions
> Agent home for Datum, with what it is, pricing, and how to act: https://agents.datum.net
> If you can only fetch URLs: read https://www.datum.net/docs/llms.txt in full and open the most specific page for the task. Commands, limits, and field paths are on task, operations, and limits pages, not on section overviews. Pages described as "Documentation is coming soon" are placeholders.
> If you have a shell or can save files: download https://www.datum.net/docs/llms-full.txt (every page, about 740 KB) once and search it with grep, instead of fetching pages one at a time.
> datumctl describes itself: `datumctl api-resources` lists resource types and `datumctl explain <resource>` shows a schema. To act on live resources, use Datum MCP or datumctl. To search the docs, use the Docs MCP server at https://www.datum.net/docs/mcp.

# Manage passkeys

> Add, name, and remove the passkeys you use to sign in to Datum Cloud, and keep a backup sign-in method.

A passkey lets you sign in to Datum Cloud with your fingerprint, face, or device PIN instead of a password. You can add passkeys on several devices and remove the ones you no longer use. You do both on the **Passkeys** page.

> [!NOTE]
>
> If you last signed in more than 10 minutes ago, Datum asks you to confirm it's you before it shows the **Passkeys** page.

## Open the Passkeys page

To open the **Passkeys** page, follow these steps:

1. In the Cloud Portal, click your avatar or initials in the top right, and click **Account Settings**.
2. Click the **Security** tab.
3. In **Sign-in Methods**, next to **Passkeys**, click **Add** if you have no passkeys, or **Manage** if you have at least one.
4. If **Confirm it's you** opens, choose one of your sign-in methods, such as **Passkey**, and confirm.

The **Passkeys** page opens in a new browser tab. It lists each passkey with its name and the date you added it. Close the tab to return to the portal.

## Add a passkey

Each device or password manager holds one passkey for your account. To add a passkey on the device you're using, follow these steps:

**1. Start setup**

On the **Passkeys** page, click **Add passkey**.

**2. Register the passkey**

On **Set up passkey**, click **Register passkey**, and confirm with your device.

If the device already has a passkey for your account, Datum shows "You already have a passkey for this account on this device." Use a different device instead.

**3. Name the passkey**

On **Name your passkey**, keep the suggested name or enter your own in **Passkey name**, and click **Save**.

The name is optional and can be up to 200 characters. You can't rename a passkey later, so pick a name that tells you which device it's on, such as `Work laptop`.

Datum sends you an email with the subject "New passkey added to your Datum account".

To add a passkey on another device, such as your phone, sign in to the Cloud Portal on that device and repeat these steps.

## Remove a passkey

To remove a passkey, follow these steps:

1. On the **Passkeys** page, click the trash icon next to the passkey.
2. In **Remove this passkey?**, click **Remove passkey**. The passkey stops working for sign-in, and you can't undo this.
3. In **Passkey removed**, choose one of the following:
   * To sign out every other device that's signed in to your account, click **Sign out other sessions**. Do this if you removed the passkey because you lost the device.
   * To stay signed in on your other devices, click **Not now**.

Datum sends you an email with the subject "A passkey was removed from your Datum account".

The passkey stays in your device or password manager until you delete it there.

## Keep a backup sign-in method

You can't remove your only sign-in method. If you try, the **Passkeys** page shows "You can't remove your only sign-in method. Add another method first."

To keep a way in if you lose a device, do one or both of the following:

* Add passkeys on more than one device.
* Link your Google or GitHub account: on the **Security** tab, in **Sign-in Methods**, click **Connect** next to Google or GitHub. On **Linked accounts**, under **Available accounts to link**, click the provider and sign in to that account.

If you lose access to every sign-in method, see [Recover your account](https://www.datum.net/docs/account/recover-account.md).

## If you get an email about a change you didn't make

If you get a passkey email that you don't expect, do the following:

1. Open the **Passkeys** page and remove any passkey you don't recognize.
2. In the Cloud Portal, go to **Account Settings** > **Active Sessions** and click the trash icon (**Revoke**) next to any session you don't recognize.
3. Contact [support@datum.net](mailto:support@datum.net).

## What's next

* To sign in with a passkey, including one on your phone, see [Sign in](https://www.datum.net/docs/account/sign-in.md).
* To get back into your account when you can't use any of your passkeys, see [Recover your account](https://www.datum.net/docs/account/recover-account.md).


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