Getting an error while invoking REST endpoint setidsets

Summary: I am getting 403 Forbidden error when invoke setidsets REST Endpoint. URL: https://<servername>:443/fscmRestApi/resources/11.13.18.05/setidsets

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I get below error when I try to invoke REST API to fetch SETID sets

CDATA[.403 error (forbidden), usually implies a lack of permissions to access the API. You might be required to consult the target API documentation or work with the owner/administrator to resolve this issue. There may be several conditions leading to this, but the exact cause is best described by the target service authorization server. Some probable causes of 403 errors are as follows: (i) The current user is not authorized to access the resources, (ii) The access token was procured for a scope that does not cover the API being accessed, (iii) The access token expired or is not valid to access the resource any longer, (iv) The authorization server revoked access privileges to a particular resource.]