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

# Update Custom Audience Users

> Adds or removes users in a Reddit Ads custom audience using emails or mobile advertising IDs (hashed automatically); one identifier kind per call

Adds or removes users in a Reddit Ads custom audience using emails or mobile advertising IDs (hashed automatically); one identifier kind per call. Find audience IDs with reddit\_ads\_list\_custom\_audiences.

| | |
| - | - |
| **App** | Reddit Ads |
| **Operation ID** | `reddit_ads_update_custom_audience_users` |
| **Type** | Action |
| **Connection** | `reddit_ads` (required) |
| **Credits per run** | 1 |
| **Agent / MCP tool** | Yes |
| **Requires approval** | Yes (write operation) |

## Inputs

| Field | Type | Required | Default | Description |
| - | - | - | - | - |
| `account` | DynamicAccount | Yes | - | Select the Reddit Ads account that owns the audience. |
| `audience_id` | string or SelectItem | Yes | - | ID of the custom audience to update. Find audience IDs with reddit\_ads\_list\_custom\_audiences. |
| `action` | string or SelectableOption | Yes | - | Whether to add or remove the users. Options: 'ADD', 'REMOVE'. |
| `emails` | string or array of string | No | - | Email addresses as a list or comma/newline separated text. Plain emails are normalized (whitespace removed, lowercased) and SHA-256 hashed automatically; already-hashed 64-hex values pass through. Use emails or mobile\_device\_ids, not both. |
| `mobile_device_ids` | string or array of string | No | - | Mobile advertising IDs (IDFA / AAID) as a list or comma/newline separated text; hashed automatically. Use emails or mobile\_device\_ids, not both. |

### SelectItem

| Field | Type | Required | Default | Description |
| - | - | - | - | - |
| `value` | string | Yes | - | The value of the selectable item. |
| `label` | string | Yes | - | The label of the selectable item, used for display purposes. If not provided, defaults to the value. |

### SelectableOption

| Field | Type | Required | Default | Description |
| - | - | - | - | - |
| `value` | string | Yes | - | |
| `label` | string | Yes | - | |

## Output

**Type**: `Dict`

Returns the action and user counts.

**Fields**: `audience_id`, `action`, `identifier_type`, `user_count`


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