Rest API POST request- Facing Issue with Edit Facet enabling

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Hello, I have been using the REST API (Postman) to make GET and POST requests. While I am able to successfully perform GET requests on the representation, I encounter an error when attempting to make a POST request. The error message states that the edit facet cannot be accessed.

I have attempted to enable the edit facet of the representation, but it appears that facets are disabled, and I am unable to find a way to enable them.

Could anyone please guide me as to why I am seeing facets disabled and how I can enable them?