Unable to Send SMS from production or Sandbox from Ringcentral Playground

Hello I am working on the apis integrations of the ring central and in the sandbox/production i am getting the error:

{
"errorCode": "FeatureNotAvailable",
"message": "The requested feature is not available",
"errors": [
{
"errorCode": "MSG-242",
"message": "The requested feature is not available"
}
]
}

mY API Call is:
fetch("https://platform.devtest.ringcentral.com/restapi/v1.0/account/~/extension/~/sms", {
"headers": {
"accept": "application/json",
"accept-language": "en-US,en;q=0.9",
"authorization": "Bearer XXXXXXXXXXXXXXXXXXX",
"content-type": "application/json",
},
"referrer": "https://developers.ringcentral.com/",
"referrerPolicy": "strict-origin-when-cross-origin",
"body": "{\"from\":{\"phoneNumber\":\"+13133982294\"},\"to\":[{\"phoneNumber\":\"+13133982294\"}],\"text\":\"test message\"}",
"method": "POST",
});