TestRail API endpoint update_user/:user_id returning HTTP 404("Unknown method 'update_user'")

Question

I am attempting to use the TestRail API to update a user using endpoint: POST index.php?/api/vs/update_user/:user_id. I am receiving an error TestRail API returned HTTP 404("Unknown method 'update_user'"). I am using the Java API client and TestRail version 7.0.2.1016

I am able to get a successful return on some of the different API methods (such as get user, get user by id/email, add/update/delete project). I believe some endpoints may not be compatible with my version of TestRail based on the API docs but can't find anything in the API docs to suggest that would apply to this update_user endpoint. However, if that is the case, is there another endpoint to update the user compatible with my current version? Example request below.

Map<String, String> map = new HashMap<>();
map.put("role", "Guest");

JSONObject result = (JSONObject) client.sendPost("update_user/213", map);