Not able to call servicedeskapi using OAuth2.0

[Neha Sachan]

I want to call rest based ServiceDesk Api to create Customer.

Below is the URL

https://api.atlassian.com/ex/jira/4186187e-79dd-408d-9f14-0e25293a860c/rest/servicedesk/1/pages/people/customers/pagination/CUS/invite

i am passing token which generated using OAuth2.0 but it says 

{ "errorMessages": [ "OAuth 2.0 is not enabled for this method." ]}

i have granted all Service Desk Api scopes to execute this.

Help me to run this Api.