Microsoft graph api Microsoft Graph API findMeetingTimes未正确返回可用空间

我正在使用findMeetingTimes API，当我需要API向我推荐任何可用房间时，它总是返回相同的结果。它正在把离我最近的房间还给我，即使它不可用。我正在进入其他房间，但它没有返回。 另外，我在爱尔兰，试图利用爱尔兰的时间。只有UTC可用作时间选项。有什么想法吗

{
    "attendees": [{
            "type": "required",
            "emailAddress": {
                "name": "John Brady",
                "address": "test1@test.com"
            }
        },
        {
            "type": "required",
            "emailAddress": {
                "name": "Micheal Travers",
                "address": "test2@test.com"
            }
        }

    ],
    "locationConstraint": {
        "isRequired": "true",
        "suggestLocation": "true",
        "locations": [{
                "resolveAvailability": "true",
                "displayName": "The Rockefeller Room/THE ROCK PHASE 1",
                "locationEmailAddress": "the.rockefeller.room@test.com"
            },
            {
                "resolveAvailability": "true",
                "displayName": "The Cork Room/THE ROCK PHASE 2",
                "locationEmailAddress": "the.cork.room@test.com"
            },
            {
                "resolveAvailability": "true",
                "displayName": "The Dublin Room/THE ROCK PHASE 2",
                "locationEmailAddress": "the.dublin.room@test.com"
            }
        ]
    },
    "timeConstraint": {
        "activityDomain": "work",
        "timeslots": [{
            "start": {
                "dateTime": "2017-10-23T09:00:00",
                "timeZone": "UTC"
            },
            "end": {
                "dateTime": "2017-10-23T17:00:00",
                "timeZone": "UTC"
            }
        }]
    },
    "meetingDuration": "PT30M",
    "returnSuggestionReasons": "true",
    "MaxCandidates": "10",
    "minimumAttendeePercentage": "100"
} 

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同样，这里创建了两个用户和两个房间，使用outlook365网页将一个用户预订到一个房间，并查询两个房间和两个用户的api。4个问题。我预订的用户当天上午无法预订，这是正确的，但另一个用户在同一个上午有两个房间可供选择。显然不起作用。

请添加查询参数和发送到API的内容。感谢我在Graph.microsoft.com的图形浏览器中执行上述操作，这就是我所面临的问题。