Error When create webinar registrants code: -1

[Ian_SITNB (Ian)]

Hi @tommy,
POST: https://api.zoom.us/v2/webinars/97401033545/registrants
Body:
{
“email":"test1@gmail.com”,
“first_name”: “TEST”,
“last_name”: “TEST”,
“phone”: “1111111”
}
Result: 400 Bad Request
{
“code”: -1,
“message”: null
}