Zoho Desk API - Send Reply to CUSTOMERPORTAL

Zoho Desk API - Send Reply to CUSTOMERPORTAL

I'll try to send a reply to Customer Portal, But the response is 500 (INTERNAL_SERVER_ERROR in service response).
  1. {"Error":"{\"errorCode\":\"INTERNAL_SERVER_ERROR\",\"message\":\"An internal server error occurred while performing this operation.\"}"}

Post Object:

  1. {
  2.   "channel": "CUSTOMERPORTAL",
  3.   "attachmentIds": [],
  4.   "to": "user@domain.com.br",
  5.   "fromEmailAddress": "user@zohosupport.com",
  6.   "contentType": "html",
  7.   "content": "HTML Content",
  8.   "isForward": "true"
  9. }
Reply in Emails works, but not register on Customer Portal.
Thanks in advance.

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