API subscription Validation Failed - SBX_006305

Hi,

I have signed up for sandbox and could get access token using my client id and secret. But when trying to get otp for abha enrollment by aadhar, it responds with below message.
{
“code”: “900908”,
“message”: "Resource forbidden ",
“description”: “User is NOT authorized to access the Resource. API Subscription validation failed.”
}
Kindly help
Thanks
Yogesh