Permission to see External Identifier from API

Summary:

Content (please ensure you mask any confidential information):

This is the url of API (GET):

https://****-test.fa.ocs.oraclecloud.com/hcmRestApi/resources/latest/workers?q=PersonNumber='12230'&expand=externalIdentifiers

Worker data are available but ExternalIdentifers is blank:

How to retrieve also externalIdentifiers data?

The same call with a different user can do it:

So what is the missing privilege?

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):