findMeetingTimes doesn't return all available slots

Question

Hi, I'm trying to query the available slots from Outlook Calendar using MSGraph findMeetingTimes endpoint. I'm sending this body:

{"attendees":[{"type":"required","emailAddress":{"address":"******@email.com"}}],"timeConstraint":{"activityDomain":"work","timeSlots":[{"start":{"dateTime":"2022-08-22 00:00:00","timeZone":"Central European Standard Time"},"end":{"dateTime":"2022-08-28 23:59:59","timeZone":"Central European Standard Time"}}]},"isOrganizerOptional":"true","meetingDuration":"PT105M","maxCandidates":1000,"locationConstraint":{"isRequired":"true","suggestLocation":"false","locations":[{"resolveAvailability":"false","locationEmailAddress":"******@email.com","displayName":"Room 0"},{"resolveAvailability":"false","locationEmailAddress":"******@email.com","displayName":"Room 1"},{"resolveAvailability":"false","locationEmailAddress":"******@email.com","displayName":"Room 2"}]}}  

And in the Outlook there are two slots available from 9:00 to 10:45 (105 minutes) and from 10:45 to 12:30 (105 minutes) on 2022-08-26. Locations are also available at those periods of time
But MSGraph only returns first slot and ignores the second one. But it gives me two slots when I change meetingDuration option from PT105M to PT90M, adding an extra gap between the slots. Is it required by findMeetingTimes to have a 15 minutes gap between slots? I didn't find anything about that in the docs. Could it be configured somehow? Thanks in advance

Answer 1

Hi @Serhii Kondratiuk

Hope you are doing well.

Per my research, FindMeetingTimes graph API works in this way only. It will not return all the time slots/meeting suggestions between a given range. You can always check suggestionReason property in API response to know the reason for suggesting the meeting time.

Currently, with available documentation there is no specific time period range given for findMeetingTimesAPI.

Please refer these Similar posts for more details-

https://learn.microsoft.com/en-us/answers/questions/839385/findmeetingtimes-api-is-not-returning-time-slots-f.html
https://learn.microsoft.com/en-us/answers/questions/870083/findmeetingtimes-in-ms-graph-not-returning-all-eve.html

Note: If you want to know free/busy availability information for a collection of users, distributions lists, or resources (rooms or equipment) for a specified time period, you can use getSchedule graph API.

Hope this helps.

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