Unauthorized error on running Symantec Endpoint Protection REST API script

Products

• Endpoint Protection

Issue/Introduction

You want to manage Endpoint Protection Manager (SEPM) using REST API with PowerShell.
You have run the PowerShell SEPM Authentication script successfully and received the token. Now, when you try to run the other scripts using the token received during  Endpoint Protection Manager (SEPM) authentication, you get an error message as The remote server returned an error: (401)  Unauthorized.

Environment

Release : 14.3.x

Cause

You are using Administrator account and not System Administrator account of Endpoint Protection Manager (SEPM) while running the SEPM_Authentication PowerShell script.

Resolution

Administrator account has limited access that causes the script execution failure with error message as Unauthorized. Administrator account with Rights as "Not authorized to manage this site" or "Authorized to manage this site" will still receive same error.
You need Endpoint Protection Manager (SEPM) System Administrator account access to execute the script successfully. 

Additional Information

Reference link for downloading the REST API scripts : https://knowledge.broadcom.com/external/article/179015/endpoint-protection-14-rest-api-and-powe.html