How can I use FindMeetingTimes in the Graph API (SDK 5.35) from Azure Function to retrieve available appointments?

Question

How can I use FindMeetingTimes in the Graph API (SDK 5.35) from Azure Function to retrieve available appointments?

If you run a common sample, you will get

GraphClient.Me.FindMeetingTimes, [/me request is only valid with delegated authentication flow.] error

If GraphClient.Users["id"].FindMeetingTimes, [Invalid user address] error

The following is the result.

Answer 1

Sorry, I was multi-posting.

I got the answer on StackOverFlow.

The authentication method was changed to the Interactive provider method and the Azure configuration was changed to accommodate this.

Answer 2

Updated - Client credential flow can be implemented like this

api reference.

please refer the CarlZhao-MSFT answer

Answer 3

Hi @夏目　貴明

Do not use the client credentials flow for this API as it does not support application permissions. You should request the access token using a delegated authentication flow (auth code flow or ROPC flow) with user participation.

Code example:

// Dependencies
using Microsoft.Graph.Me.FindMeetingTimes;
using Microsoft.Graph.Models;
using Microsoft.Graph;
using Azure.Identity;

var scopes = new[] { "Calendars.ReadWrite.Shared" };

var tenantId = "TENANT_ID";

// Values from app registration
var clientId = "YOUR_CLIENT_ID";
var clientSecret = "YOUR_CLIENT_SECRET";

// For authorization code flow, the user signs into the Microsoft
// identity platform, and the browser is redirected back to your app
// with an authorization code in the query parameters
var authorizationCode = "AUTH_CODE_FROM_REDIRECT";

// using Azure.Identity;
var options = new AuthorizationCodeCredentialOptions
{
    AuthorityHost = AzureAuthorityHosts.AzurePublicCloud,
};

// https://learn.microsoft.com/dotnet/api/azure.identity.authorizationcodecredential
var authCodeCredential = new AuthorizationCodeCredential(
    tenantId, clientId, clientSecret, authorizationCode, options);

var graphClient = new GraphServiceClient(authCodeCredential, scopes);

// Code snippets are only available for the latest version. Current version is 5.x
var requestBody = new FindMeetingTimesPostRequestBody
{
	Attendees = new List<AttendeeBase>
	{
		new AttendeeBase
		{
			Type = AttendeeType.Required,
			EmailAddress = new EmailAddress
			{
				Name = "Alex Wilbur",
				Address = "alexw@contoso.onmicrosoft.com",
			},
		},
	},
	LocationConstraint = new LocationConstraint
	{
		IsRequired = false,
		SuggestLocation = false,
		Locations = new List<LocationConstraintItem>
		{
			new LocationConstraintItem
			{
				ResolveAvailability = false,
				DisplayName = "Conf room Hood",
			},
		},
	},
	TimeConstraint = new TimeConstraint
	{
		ActivityDomain = ActivityDomain.Work,
		TimeSlots = new List<TimeSlot>
		{
			new TimeSlot
			{
				Start = new DateTimeTimeZone
				{
					DateTime = "2023-12-11T09:00:00",
					TimeZone = "Pacific Standard Time",
				},
				End = new DateTimeTimeZone
				{
					DateTime = "2023-12-11T17:00:00",
					TimeZone = "Pacific Standard Time",
				},
			},
		},
	},
	IsOrganizerOptional = false,
	MeetingDuration = TimeSpan.Parse("PT1H"),
	ReturnSuggestionReasons = true,
	MinimumAttendeePercentage = 100d,
};

var result = await graphClient.Me.FindMeetingTimes.PostAsync(requestBody, (requestConfiguration) =>
{
	requestConfiguration.Headers.Add("Prefer", "outlook.timezone=\"Pacific Standard Time\"");
});

Hope this helps.

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