crmRestApi/resources/latest/account return 401 Unauthorized

Content (required):

How can I make the self-service contact, created through the Digital Customer Service portal, be allowed to make a REST request to the account API?

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

11.13.18.05:9

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

Method Get All Accounts:

proxy/crmRestApi/resources/11.13.18.05:9/accounts