REST endpoint /customers/search not working for multi-store newsletter subscriptions

[moiashvin]

Preconditions (*)

1. Magento version 2.4.1
2. Magento 2.4-develop
3. Admin -> Stores -> Configuration -> Customers -> Customer Configuration -> Account Sharing Options and set Share Customer Accounts to Global

4. Multiple-store views setup in Magento

5. Have one customer ( test@example.com for ex.);

Steps to reproduce (*)

1. Go to Admin -> Customers -> All Customers and open customer for edit;
2. On left side, select Newsletter, to have the Newsletter Informaiton panel where all stores views are displayed.
3. Select more than 1 checkbox to subscriber customer to the store's newsletter and save customer
   (at this point, in Newsletter Subscribers view, customer is subscribed to newsletter for multiple-store views)

4. Use REST to call GET /V1/customers/search to retrieve the customer

V1/customers/search?searchCriteria[filterGroups][0][filters][0][field]=email&searchCriteria[filterGroups][0][filters][0][value]=test@example.com&searchCriteria[filterGroups][0][filters][0][conditionType]=eq

Expected result (*)

1. Customer details are returned correctly

Actual result (*)

1. Exception occurs.
   {
   "message": "Internal Error. Details are available in Magento log file. Report ID: webapi-xxx"
   }

2. And in the exception.log file:

[2020-12-07 10:36:54] main.CRITICAL: Report ID: webapi-5fce05c67a1e6; Message: Item (Magento\Customer\Model\Customer\Interceptor) with the same ID "1" already exists. {"exception":"[object] (Exception(code: 0): Report ID: webapi-5fce05c67a1e6; Message: Item (Magento\\Customer\\Model\\Customer\\Interceptor) with the same ID \"1\" already exists. at /var/www/html/magento24/lib/internal/Magento/Framework/Webapi/ErrorProcessor.php:208, Exception(code: 0): Item (Magento\\Customer\\Model\\Customer\\Interceptor) with the same ID \"1\" already exists. at /var/www/html/magento24/lib/internal/Magento/Framework/Data/Collection.php:408)"} []

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• [x ] Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @moiashvin. Thank you for your report.
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[m2-assistant]

Hi @engcom-Alfa. Thank you for working on this issue.
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[magento-engcom-team]

✅ Confirmed by @engcom-Alfa
Thank you for verifying the issue. Based on the provided information internal tickets MC-39712 were created

Issue Available: @engcom-Alfa, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.