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

# Can You Block Customer Profile Merging

Yes. If you assign a unique identifier to each customer, you can prevent Maestra from merging customer profiles that have different IDs.

## How to block merging

In the settings for the customer's unique identifier, turn on the **Do not merge customers with different IDs** option.

**1. Open the unique identifier settings**

Go to the parameters of the unique customer identifier you use to distinguish customers in your system.

**2. Enable the option**

Activate **Do not merge customers with different IDs**.

Once enabled, Maestra will keep customer profiles separate whenever they carry different values of that identifier, even if other matching signals (such as email or phone) would normally trigger a merge.

## Why use this setting

This setting preserves the integrity of customer profiles when each customer has a distinct unique ID in your system. It's useful when your source of truth (for example, a CRM or loyalty platform) guarantees that two different IDs always represent two different people, and you don't want Maestra to combine them.

> [!NOTE]
>
> The block only applies to customers whose unique IDs differ. Profiles without an ID, or profiles sharing the same ID, follow Maestra's standard merging rules.


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