User needs to have [OrganizeConference] permission for requested resource.

When calling this API "https://platform.devtest.ringcentral.com/restapi/v1.0/account/~/extension/~/conferencing?access_token=token", I got the following error

{

"errorCode" : "CMN-408",

"message" : "In order to call this API endpoint, user needs to have [OrganizeConference] permission for requested resource.",

"errors" : [ {

"errorCode" : "CMN-408",

"message" : "In order to call this API endpoint, user needs to have [OrganizeConference] permission for requested resource.",

"permissionName" : "OrganizeConference"

} ],

"permissionName" : "OrganizeConference"

}

I added all possible permissions, what did I still miss? Please advise

I used a Super Admin account to authorize.

Thanks