Redfish serialinterfaces API fails with "IDRAC.2.5.LIC501" error for enterprise license

I have a requirement to read data from com port programmatically. Trying with below API to read data from com port. Serial over lan is enabled in idrac. Idrac has enterprise licence. Using below api with root account. 

curl --location --request POST 'https://172.18.32.22/redfish/v1/Managers/iDRAC.Embedded.1/SerialInterfaces/Serial.1/Actions/Oem/DellSerialInterface.SerialDataExport' --header 'Content-Type: application/json' --header 'Authorization: Basic auth-data' --data-raw '{}'

Getting license error when above API is hit. 

{
"error": {
"@Message.ExtendedInfo": [
{
"Message": "A required license is missing or expired.",
"MessageArgs": [],
"MessageArgs@odata.count": 0,
"MessageId": "IDRAC.2.5.LIC501",
"RelatedProperties": [],
"RelatedProperties@odata.count": 0,
"Resolution": "Obtain an appropriate license from Dell Digital Locker and then try again. If the problem persists, refer to the product documentation or contact technical support.",
"Severity": "Warning"
}
],
"code": "Base.1.8.GeneralError",
"message": "A general error has occurred. See ExtendedInfo for more information"
}
}