MS Entra – Calendars – Update Event

Update an event for a user calendar.

Action details

Property	Value
Action label	MS Entra – Calendars – Update Event
Category	CloudTools
Apex class and method	UpdateMSGraphEvent.updateEvent
Input type	UpdateMSGraphEvent.UpdateMSGraphEventInput
Output type	List<MSGraphEvent>
Authorization	Microsoft 365 connector; supported authorization depends on the endpoint and target.
Microsoft Graph request	PATCH /me/calendar/events/{eventId} or the selected user/calendar path; group event path where exposed

Prerequisites and permissions

Configure a CloudTools Connector with Connector Type set to Microsoft 365. Complete sign-in for OAuth Delegated (Authorization Code). For supported OAuth Application (Client Credentials) requests, grant application permissions and administrator consent. The identity must have access to the selected resource; directory operations can also require Microsoft Entra roles. Use Creating an Entra ID App and Integration Connectors for setup.

The action permission provider declares these alternatives. They are not cumulative requirements, not all are least privileged, and a scope can have target-specific restrictions. Check the Microsoft operation reference before selecting permissions.

Permission type	Declared alternatives
Delegated	Calendars.ReadWrite
Application	Calendars.ReadWrite

Endpoints: /me/calendar/events/{event-id}; /me/calendars/{calendar-id}/events/{event-id}; /users/{idOrUserPrincipalName}/calendar/events/{event-id}; /users/{idOrUserPrincipalName}/calendars/{calendar-id}/events/{event-id}

See the Microsoft operation and permissions reference.

Inputs

Input	Apex field	Type	Required	Description
User Email	userEmail	String	No	Email address of the user
Event Id	eventId	String	Yes	Event identifier
Calendar Id	calendarId	String	No	Calendar identifier (leave empty for default calendar)
Event	eventItem	MSGraphEvent	Yes	Event details
Attendees	attendeesCsv	String	No	Comma-delimited list of attendee email addresses.

Supply a nonempty list with a non-null first request. Graph actions process only that first request. Global inputs do not expose connectorId; subscriber Apex and Flow use CloudTools connector selection. Use Microsoft Graph resource IDs or the specifically documented user identifier, and resolve dynamic values before invocation.

Event fields (MSGraphEvent)

Field	Apex field	Type	Required	Description
id	id	String	No	Mapped drive item property; populated only when returned and supported by the resource.
odataEtag	odataEtag	String	No	Mapped drive item property; populated only when returned and supported by the resource.
subject	subject	String	No	Mapped drive item property; populated only when returned and supported by the resource.
bodyPreview	bodyPreview	String	No	Mapped drive item property; populated only when returned and supported by the resource.
body	body	MSGraphEventBody	No	Mapped drive item property; populated only when returned and supported by the resource.
startTime	startTime	MSGraphDateTimeTimeZone	No	Mapped drive item property; populated only when returned and supported by the resource.
endTime	endTime	MSGraphDateTimeTimeZone	No	Mapped drive item property; populated only when returned and supported by the resource.
originalStartTimeZone	originalStartTimeZone	String	No	Mapped drive item property; populated only when returned and supported by the resource.
originalEndTimeZone	originalEndTimeZone	String	No	Mapped drive item property; populated only when returned and supported by the resource.
location	location	MSGraphEventLocation	No	Mapped drive item property; populated only when returned and supported by the resource.
isAllDay	isAllDay	Boolean	No	Mapped drive item property; populated only when returned and supported by the resource.
showAs	showAs	String	No	Mapped drive item property; populated only when returned and supported by the resource.
isCancelled	isCancelled	Boolean	No	Mapped drive item property; populated only when returned and supported by the resource.
isOrganizer	isOrganizer	Boolean	No	Mapped drive item property; populated only when returned and supported by the resource.
importance	importance	String	No	Mapped drive item property; populated only when returned and supported by the resource.
sensitivity	sensitivity	String	No	Mapped drive item property; populated only when returned and supported by the resource.
categories	categories	List<String>	No	Mapped drive item property; populated only when returned and supported by the resource.
createdDateTime	createdDateTime	String	No	Mapped drive item property; populated only when returned and supported by the resource.
lastModifiedDateTime	lastModifiedDateTime	String	No	Mapped drive item property; populated only when returned and supported by the resource.
changeKey	changeKey	String	No	Mapped drive item property; populated only when returned and supported by the resource.
iCalUId	iCalUId	String	No	Mapped drive item property; populated only when returned and supported by the resource.
webLink	webLink	String	No	Mapped drive item property; populated only when returned and supported by the resource.
isReminderOn	isReminderOn	Boolean	No	Mapped drive item property; populated only when returned and supported by the resource.
reminderMinutesBeforeStart	reminderMinutesBeforeStart	Integer	No	Mapped drive item property; populated only when returned and supported by the resource.
eventType	eventType	String	No	Mapped drive item property; populated only when returned and supported by the resource.
onlineMeetingUrl	onlineMeetingUrl	String	No	Mapped drive item property; populated only when returned and supported by the resource.
isOnlineMeeting	isOnlineMeeting	Boolean	No	Mapped drive item property; populated only when returned and supported by the resource.
onlineMeetingProvider	onlineMeetingProvider	String	No	Mapped drive item property; populated only when returned and supported by the resource.
organizer	organizer	MSGraphEventOrganizer	No	Mapped drive item property; populated only when returned and supported by the resource.
responseStatus	responseStatus	MSGraphEventResponseStatus	No	Mapped drive item property; populated only when returned and supported by the resource.
attendees	attendees	List<MSGraphEventAttendee>	No	Mapped drive item property; populated only when returned and supported by the resource.

Outputs

Returns one mapped MSGraphEvent inside a list. Check the actual result shape and fields before use. This implementation creates a default result object when the response is null; an object alone does not prove that a resource was returned.

Output	Apex field	Type	Description
id	id	String	Mapped drive item property; populated only when returned and supported by the resource.
odataEtag	odataEtag	String	Mapped drive item property; populated only when returned and supported by the resource.
subject	subject	String	Mapped drive item property; populated only when returned and supported by the resource.
bodyPreview	bodyPreview	String	Mapped drive item property; populated only when returned and supported by the resource.
body	body	MSGraphEventBody	Mapped drive item property; populated only when returned and supported by the resource.
startTime	startTime	MSGraphDateTimeTimeZone	Mapped drive item property; populated only when returned and supported by the resource.
endTime	endTime	MSGraphDateTimeTimeZone	Mapped drive item property; populated only when returned and supported by the resource.
originalStartTimeZone	originalStartTimeZone	String	Mapped drive item property; populated only when returned and supported by the resource.
originalEndTimeZone	originalEndTimeZone	String	Mapped drive item property; populated only when returned and supported by the resource.
location	location	MSGraphEventLocation	Mapped drive item property; populated only when returned and supported by the resource.
isAllDay	isAllDay	Boolean	Mapped drive item property; populated only when returned and supported by the resource.
showAs	showAs	String	Mapped drive item property; populated only when returned and supported by the resource.
isCancelled	isCancelled	Boolean	Mapped drive item property; populated only when returned and supported by the resource.
isOrganizer	isOrganizer	Boolean	Mapped drive item property; populated only when returned and supported by the resource.
importance	importance	String	Mapped drive item property; populated only when returned and supported by the resource.
sensitivity	sensitivity	String	Mapped drive item property; populated only when returned and supported by the resource.
categories	categories	List<String>	Mapped drive item property; populated only when returned and supported by the resource.
createdDateTime	createdDateTime	String	Mapped drive item property; populated only when returned and supported by the resource.
lastModifiedDateTime	lastModifiedDateTime	String	Mapped drive item property; populated only when returned and supported by the resource.
changeKey	changeKey	String	Mapped drive item property; populated only when returned and supported by the resource.
iCalUId	iCalUId	String	Mapped drive item property; populated only when returned and supported by the resource.
webLink	webLink	String	Mapped drive item property; populated only when returned and supported by the resource.
isReminderOn	isReminderOn	Boolean	Mapped drive item property; populated only when returned and supported by the resource.
reminderMinutesBeforeStart	reminderMinutesBeforeStart	Integer	Mapped drive item property; populated only when returned and supported by the resource.
eventType	eventType	String	Mapped drive item property; populated only when returned and supported by the resource.
onlineMeetingUrl	onlineMeetingUrl	String	Mapped drive item property; populated only when returned and supported by the resource.
isOnlineMeeting	isOnlineMeeting	Boolean	Mapped drive item property; populated only when returned and supported by the resource.
onlineMeetingProvider	onlineMeetingProvider	String	Mapped drive item property; populated only when returned and supported by the resource.
organizer	organizer	MSGraphEventOrganizer	Mapped drive item property; populated only when returned and supported by the resource.
responseStatus	responseStatus	MSGraphEventResponseStatus	Mapped drive item property; populated only when returned and supported by the resource.
attendees	attendees	List<MSGraphEventAttendee>	Mapped drive item property; populated only when returned and supported by the resource.

Behavior and limits

Delegated authorization can select /me for user-calendar operations. Outside delegated access, supply the target user required by runtime validation; optional invocable user fields can still be conditionally required.

Event is an MSGraphEvent model. The action builds a PATCH from supported fields and requires at least one update. If supplied, Attendees CSV replaces the model attendee list before serialization. Nested time objects use dateTimeValue/timeZone. Read-only returned properties are not a promise of writable update support.

Use in Flow

Use MS Entra – Calendars – Update Event where supported. Use a Microsoft 365 application connector configured as Set as default for Flow automations only if the endpoint and target support application access. Supply required values, retain useful outputs, and add fault handling. Delegated connections are not supported for CloudTools Flow automation. The action processes only the first input request.

Use in custom Apex

This subscriber-org example uses the Apptigent namespace. Replace identifiers and example values before use. Configure the connector, complete authorization first, run in a context permitting callouts, and handle exceptions, empty results, and unmapped fields.

Apptigent.UpdateMSGraphEvent.UpdateMSGraphEventInput request =
    new Apptigent.UpdateMSGraphEvent.UpdateMSGraphEventInput();
request.userEmail = 'someone@example.com';
request.eventId = 'AAMkAGI2TAAA=';
request.calendarId = 'calendar-id';
request.eventItem = new Apptigent.MSGraphEvent();
request.attendeesCsv = 'alex.wilber@example.com,adele.vance@example.com';

request.eventItem.subject = 'Updated planning meeting';

List<Apptigent.MSGraphEvent> results =
    Apptigent.UpdateMSGraphEvent.updateEvent(
        new List<Apptigent.UpdateMSGraphEvent.UpdateMSGraphEventInput>{ request }
    );
System.debug(results);

Use in a Lightning Web Component

Use updateMSGraphEvent from msEntraConnectorLib through MSEntraConnectorController. These c/ imports apply in the same namespace. Set request.connectorId for direct MSEntraAction calls. The controller captures the request selection for MSEntraAction.

Global input	LWC request mapping
userEmail	request.userIdOrPrincipalName
eventId	request.eventId
calendarId	request.calendarId
eventItem	eventJson or mapped event upsert fields
attendeesCsv	request.attendeesCsv

entraActionExample.js

import { LightningElement } from 'lwc';
import { updateMSGraphEvent } from 'c/msEntraConnectorLib';

export default class EntraActionExample extends LightningElement {
    result = null;
    errorMessage = '';
    isRunning = false;
    completed = false;

    async handleRun() {
        if (this.isRunning || this.completed) return;
        this.isRunning = true;
        this.errorMessage = '';
        try {
            const request = { connectorId: 'REPLACE_WITH_CONNECTOR_RECORD_ID' };
            request.userIdOrPrincipalName = 'someone@example.com';
            request.eventId = 'AAMkAGI2TAAA=';
            request.calendarId = 'calendar-id';
            request.subject = 'Updated planning meeting';
            request.attendeesCsv = 'alex.wilber@example.com,adele.vance@example.com';
            this.result = await updateMSGraphEvent(request);
            this.completed = true;
        } catch (error) {
            this.errorMessage = error.requiresInteractiveAuthorization
                ? 'Sign in to Microsoft for the connector, then try again.'
                : error.message || 'The Entra action failed.';
        } finally {
            this.isRunning = false;
        }
    }
}

entraActionExample.html

<template>
    <lightning-button label="Run action" onclick={handleRun}
        disabled={isRunning}></lightning-button>
    <p role="alert">{errorMessage}</p>
</template>

The library returns one mapped DTO or null. The controller can flatten nested fields, serialize data, or map an action result into an operation DTO. rawJson contains serialized mapped Apex data rather than the untouched Graph response.

Use getMSEntraAuthorizationState, beginMSEntraAuthorization, and createMSEntraOAuthMessageHandler to arrange delegated sign-in. The library normalizes errors but does not automatically sign in or retry. Reset completed for a new deliberate operation, and inspect resource state before retrying a mutation with an uncertain outcome.

Error handling and troubleshooting

Symptom	What to check
Required fields error	Supply a nonempty request list and required or conditionally required inputs. For LWC, use the mapped field names.
Authorization or access denied	Check connector selection, sign-in, endpoint/target permission support, administrator consent, directory roles, and resource access.
Resource not found	Check Microsoft IDs and parent resource relationships. Preserve group/drive/item associations and mailbox/calendar/event IDs.
Missing or unexpected output	Check query support, pagination, wrapper versus item models, public-only properties, and mapped DTO fields.
Operation rejected	Inspect the Microsoft error, supported writable fields, group/calendar restrictions, recipient/license data, and file transfer limits.

See Entra connector introduction.