Forbidden when trying to call Service Desk API from Connect App

Hello!

I am sorry to bother. I have been performing calls from my Connect App to the Service Desk API without issues, but this morning I realized one call is failing in one of my environments.

I am using this endpoint: https://developer.atlassian.com/cloud/jira/service-desk/rest/api-group-requesttype/#api-rest-servicedeskapi-requesttype-get

The connect application has READ scope, and I am performing the call from my back end, like this:

addon.httpClient(req).get({
    url: `/rest/servicedeskapi/requesttype?searchQuery=`,
    helpers: {
      'X-ExperimentalApi': 'opt-in'
    }
  }, function (err, res, body) {
    console.log(res.statusCode)
    console.log(res.statusMessage)
  });

The call is failing with Forbidden (403) status.
Any idea what could be possibly failing?

Thank you!