magento-test/app/code/Magento/Customer/etc/webapi_rest/di.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
     <type name="Magento\Framework\Authorization">
        <plugin name="customerAuthorization" type="Magento\Customer\Model\Plugin\CustomerAuthorization" />
    </type>
    <type name="Magento\Authorization\Model\CompositeUserContext">
        <arguments>
            <argument name="userContexts" xsi:type="array">
                <item name="customerSessionUserContext" xsi:type="array">
                    <item name="type" xsi:type="object">Magento\Customer\Model\Authorization\CustomerSessionUserContext\Proxy</item>
                    <item name="sortOrder" xsi:type="string">20</item>
                </item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Customer\Api\CustomerRepositoryInterface">
        <plugin name="updateCustomerByIdFromRequest" type="Magento\Customer\Model\Plugin\UpdateCustomer" />
    </type>
    <type name="Magento\Customer\Model\Customer\AuthorizationComposite">
        <arguments>
            <argument name="authorizationChecks" xsi:type="array">
                <item name="rest_customer_authorization" xsi:type="object">
                    Magento\Customer\Model\Customer\Authorization
                </item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Webapi\Controller\Rest\ParamsOverrider">
        <plugin name="validateCustomerData" type="Magento\Customer\Plugin\Webapi\Controller\Rest\ValidateCustomerData" sortOrder="1" disabled="false" />
    </type>
    <preference for="Magento\Customer\Api\AccountManagementInterface"
                type="Magento\Customer\Model\AccountManagementApi" />
</config>