Can not list self hosted runners with REST API

{
  "message": "Not Found",
  "documentation_url": "https://docs.github.com/rest/reference/actions#list-self-hosted-runners-for-a-repository"
}

I am trying to hit https://api.github.com/repos/<org>/<repo>/actions/runners but I get a 404. This is a private repo. Getting https://api.github.com/repos/<org>/<repo> works with the same credentials.

I am using a personal access token with repo access.

Relevant headers

      "x-oauth-scopes": "repo",
      "x-accepted-oauth-scopes": "",