Getting error while adding AD Group as a Gateway - Datasource User using API

I have created a Gateway cluster using the powershell cmdlet DataGateway and added the Service Principal as an admin of that gateway cluster. 

The Service Principal contains the Gateway.ReadWrite.All & DataSet.ReadWrite.All permission scopes.

In the Api documentation(https://docs.microsoft.com/en-us/rest/api/power-bi/gateways/adddatasourceuser) for Add Gateway DataSource User, the request body contains the following parameters:
datasourceAccessRight
displayName
emailAddress
identifier
principalType

Since the Datasource is created using API, the Service Principal already exists as a Datasource User.

I am able to add a normal user also by passing the request as:
{ "emailAddress": "[email protected]", "datasourceAccessRight": "Read" }

using the API and Service Principal.

I tried to add an AD group by following the sample provided in the documentation for service principal:

{ "identifier": "3d9b93c6-7b6d-4801-a491-1738910904fd", "datasourceAccessRight": "ReadOverrideEffectiveIdentity" }

and made some changes to the request JSON by adding principalType as Group:

{

  "datasourceAccessRight": "Read",

  "identifier": "AD group id",

  "principalType": "Group"

}

But I am getting the below error:

{"error":{"code":"DMTS_PrincipalsAreInvalidError","pbi.error":{"code":"DMTS_PrincipalsAreInvalidError","parameters":{},"details":[],"exceptionCulprit":1}}}

Why is this error coming? In this documentation page, it is not mentioned about mailEnabled groups only. Also, the request json was created based on the example provided for Service Principal.

Is there any solution to add an AD group as a Gateway - Datasource User ?