Zoho books API Authentication

I Have created self client with below Scope

ZohoCRM.modules.ALL,ZohoCRM.settings.ALL,ZohoBooks.fullaccess.ALL,ZohoCRM.change_owner.CREATE

And also i generated Auth token using. https://accounts.zoho.in/oauth/v2/token?

I am able to access all ZOHo CRM Related API's . However when tried for "https://www.zohoapis.in/books/v3/organizations"

Getting below Error

{
    "code": 14,
    "message": "The request could not be authenticated as the authentication value you entered is invalid. Enter a valid authentication value and try again."

}