Create Or Update Role API returns 404

Elastic Stack Kibana
1

Hi,
We follow the instructions as described here

We are trying to create a role via the Kibana security API, but we are getting 404.
If we try to send a "GET" request instead of "PUT" it works.

Elastic + Kibana version: 7.2.0 / 7.4.1 (we have tried both of them)

2

Can you provide the CURL request used with the 404 response?

3

When using CURL I get nothing. not even an error.
What I'm using is POSTMAN, with following url:
http://kbnsrvr:5601/api/security/role/test2

The body is irrelevant, I think, because I get a 404 error, and not an HTML.
(When using GET method, I do receive an HTML back. )