Freshservice API Returns 403 when using OAuth

Hi, I’ve followed this guide allow my custom App to authenticate into Freshserivce API via OAuth. I successfully perform the OAuth dance and then in my App’s logs, it shows 403 response: ‘{“code”:“access_denied”,“message”:“You are not authorized to perform this action.”}’.

The OAuth credentials I created have the right scopes granted (after cross checking the API docs against what endpoints my Custom App is using).

Since I’m almost positive I have the right scopes, what should I check next to find the issue?