Forbidden when trying to call Service Desk API from Connect App


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:

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

    url: `/rest/servicedeskapi/requesttype?searchQuery=`,
    helpers: {
      'X-ExperimentalApi': 'opt-in'
  }, function (err, res, body) {

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

Thank you!