I need to know Post API for Adding multiple participants in gitlab issues

My requirement is to add multiple participants to Gitlab issues to send them notification. I need not add them mentioning them because this will be pipeline triggered and every time I don’t want to send emails on adding them as participants. Hence trying to find POST Api which can directly add them as participants.

Tried this command however it shows (“error”:“404 Not Found”}curl: (3) URL using bad/illegal format or missing URL)

curl --request POST “https://gitlab.example.com/api/v4/projects/:id/issues/:issue_iid/participants
–header “PRIVATE-TOKEN: YOUR_PERSONAL_ACCESS_TOKEN”
–data “user_id=PARTICIPANT_USER_ID”