Roles/groups not syncing

Problem/Motivation

Upon saving a user that exists in Discourse, the following error message is displayed in the log:

Discourse not synchronized. Group [name] does not exist.

However the group name does exist, after some debugging I found another error when trying to search for groups.

`403 Forbidden` response: {"errors":["You need to be logged in to do that."],"error_type":"not_logged_in"}

Steps to reproduce

• Create user in Drupal
• Create user in Discourse
• Assign user in Drupal a role (that has already been synced with Discourse)
• See issue in log

Proposed resolution

Looks like the /groups/search.json endpoint maybe use to allow get params, but now this is not an option?
I found that if you apply the api-key and api-username as headers then the syncing works again.