Zoho Vault API: Create Secret ERROR 500

We are unable to create new secret with api as defined on documentation: https://www.zoho.com/vault/api/#create-a-new-secret

The response is always:

Sorry, we are unable to process your request. Please try again

The json is:

{
  "secretname": "Sample 1",
  "description": "Sample Desc",
  "classification": "E",
  "isshared": "YES",
  "logo": "",
  "tags": "fff",
  "policyid": "173014000000000063",
  "secrettypeid": "173014000000366099",
  "secretdata": {
    "username": "AwGXhRBIfl4CG6xeakXA0Q==",
    "password": "AwGJVxBIfl6PspxyLhJZ5e9EqkPAtjpd",
  },
  "secreturls": [
    "https://www.cvs.com/international.html"
  ],
  "securenote": "CgHiFxBIfl4="
}

Please consider that:
- Other API works well (getSecrets, Open Vault ecc), only this nont work
- The policyid and secrettypeid are these of our Vault