Make custom identity Attribute searchable

Hey,

I have tried to make a custom identity attribute searchable for that i have referred the document https://community.sailpoint.com/t5/IdentityNow-Articles/API-to-Extend-Customizable-Correlation-Attributes/

here the api call
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GET /cc/api/identityAttribute/list
GET /cc/api/identityAttribute/get?name=

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are not working for me through postman can you please help
I am using Sailpoint SaaS Beta API for all my api calls

This is a duplicate of Custom identity attribute.