Hi I'm trying to develop an for GSuite admin which enables to migrate their google drive data to another cloud service. But in the process of authentication i'm getting the below error.
{
"error": "unauthorized_client",
"error_description": "Client is unauthorized to retrieve access tokens using this method."
}
Below are the api's that are enabled in developer console. 1. Admin SDK 2. Contacts API 3. G Mail API 4. Calendar API 5. Drive API
Please guide me if done anything wrong in creating an app.