Updating branch protection settings via Github API

Github API - Update Branch Protection

I am trying to update the branch protection settings for a repo on github to set Require pull request reviews before merging to true. I am using the node request library to make the request.

protectBranch: function(github, org, repo, branch) {
    return new Promise((result, reject) => {
        let options = {
            'url' : github+'/repos/'+org+'/'+repo+'/branches/'+branch+'/protection',
            headers: {
                'User-Agent': 'nola-guilds-github',
                'Authorization': 'token '+process.env.GITHUB_TOKEN,
                'Accept': 'application/vnd.github.loki-preview+json'
            },
            body: {
                'required_status_checks' : {
                    'include_admins' : false,
                    'strict' : true,
                    'contexts' : ['default']
                },
                'required_pull_request_review' : {
                    'include_admins' : false
                },
                'restrictions' : null,
                'enforce_admins' : false
            },
            json: true
        }
        request.put(options, function (error, response, body) {
            if(!error && response.statusCode == 200){
                result();
            } else {
                if (error) {
                    reject(error);
                } else {
                    reject(response);
                }
            }
        });
    });
}

I get a 200 response code, and everything else is set correctly, but this one setting. I am at a loss for what the problem could be.

via Jacob Schoen