Cant obtain pipeline iid via REST API


I’m trying to obtain the pipeline iid via the REST API v4.

It is documented here:

I’m getting all the fields as expected, except for “iid”.

I found this issue and expected the iid to be deployed with it:

We are running the free edition 14.2.3-ee.

Within gitlab I can see the pipeline iid in the pipeline list of each project.
Do I have to enable anything to get it in the rest api too?