Creating Secret via Vault API

I am trying to create a secret through vault api.

This is the response I get.

One thing I am not sure is how to decrypt the secretdata, how to get the secrettypeid?

{
    "operation": {
        "result": {
            "error_code": "",
            "message": "Sorry, we are unable to process your request.",
            "status": "failed"
        }
    }
}