3319225 - Retrieving SP User ID via IAS User Management REST API results in '401 Unauthorized' with error message "Service provider cannot be determined for this request"

• While following the steps in SP User ID Retrieval to retrieve SP User ID via IAS User Management REST API, it results in '401 Unauthorized' with error message "Service provider cannot be determined for this request".
• Following is an example of a GET request using Postman, but this can be seen in other API platforms.
  
  
  
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Identity Authentication

KBA , BC-IAM-IDS , Identity Authentication Service , Problem