Update Merge Request Reviewers via the API

How do I assign multiple reveres to a Merge Request via the API? I have tried the update Merge Request call as documented.

PUT /projects/:id/merge_requests/:merge_request_iid

I’ve tried with with a list of three review_ids like so:

curl --request PUT --header "token" "https://gitlab.com/api/v4/projects/####/merge_requests/#?reviewer_ids=#######,#######,#######"

The result will be only one (the first in the list) reviewer is added to “reviewers”.

"reviewers": [ { "id": ######, "username": "user_name", "name": "name", "state": "active", "avatar_url": "...", "web_url": "..." } ]

I’m using gitlab.com

Solved: This reuquires Gitlab premium.