Entitlement is not calling OnComplete

Hi, I am trying to implement in app purchases in a quest 2 game. I created a test account and that i use for the oculus settings in the editor and for my quest. After initialising and calling the entitlement check method nothing happens. The OnComplete Method from the entitlement method is never called. i get no errors in the editor and on the quest i get an "Invalid OAuth 2.0 Access Token" Error.