Online meeting is not creating along with calendar event

Online meeting is not creating along with calendar event creation. The necessary Calendars.ReadWrite Application permission is given. Also isOnlineMeeting=true is being sent in the request body. This was working fine before and suddenly started behaving like this.

We are referring to the below API documentation.
https://learn.microsoft.com/en-us/graph/api/user-post-events?view=graph-rest-1.0&tabs=http#example-4-create-and-enable-an-event-as-an-online-meeting

Please find below the API call details.

URL:

[https://graph.microsoft.com/v1.0/users/******@Moderator note: personal info removed]/events/

Request body:

{
"isOnlineMeeting": true,
"subject": "Interview scheduled with Mr. *** - *** on Tue, December 02, 2:30 PM - 3:00 PM IST",
"attendees": [
    {
        "emailAddress": {
            "address": "***.***@[Moderator note: personal info removed]"
        },
        "type": "required"
    },
    {
        "emailAddress": {
            "address": "***.***@[Moderator note: personal info removed]"
        },
        "type": "optional"
    },
    {
        "emailAddress": {
            "address": "***.***@[Moderator note: personal info removed]"
        },
        "type": "optional"
    },
    {
        "emailAddress": {
            "address": "***.***@[Moderator note: personal info removed]"
        },
        "type": "optional"
    }
],
"start": {
    "dateTime": "2025-12-02T14:30:00",
    "timeZone": "India Standard Time"
},
"onlineMeetingProvider": "teamsForBusiness",
"end": {
    "dateTime": "2025-12-02T15:00:00",
    "timeZone": "India Standard Time"
},
"body": {
    "contentType": "HTML",
    "content": "***"
}
}

Response body:

{
"@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('[Moderator note: personal info removed]')/events/$entity",
"@odata.etag": "W/\"5+Qe7y86rkanlOeQeGkLBgACfSjd4Q==\"",
"id": "[Moderator note: personal info removed]",
"createdDateTime": "2025-12-02T06:52:13.2561443Z",
"lastModifiedDateTime": "2025-12-02T06:52:14.3673297Z",
"changeKey": "5+Qe7y86rkanlOeQeGkLBgACfSjd4Q==",
"categories": [],
"transactionId": null,
"originalStartTimeZone": "India Standard Time",
"originalEndTimeZone": "India Standard Time",
"iCalUId": "[Moderator note: personal info removed]",
"uid": "[Moderator note: personal info removed]",
"reminderMinutesBeforeStart": 15,
"isReminderOn": true,
"hasAttachments": false,
"subject": "Interview scheduled with Mr. *** - *** on Tue, December 02, 2:30 PM - 3:00 PM IST",
"bodyPreview": "***",
"importance": "normal",
"sensitivity": "normal",
"isAllDay": false,
"isCancelled": false,
"isOrganizer": true,
"responseRequested": true,
"seriesMasterId": null,
"showAs": "busy",
"type": "singleInstance",
"webLink": "https://outlook.office365.com/owa/?itemid=[Moderator note: personal info removed]&exvsurl=1&path=/calendar/item",
"onlineMeetingUrl": null,
"isOnlineMeeting": false,
"onlineMeetingProvider": "unknown",
"allowNewTimeProposals": true,
"occurrenceId": null,
"isDraft": false,
"hideAttendees": false,
"responseStatus": {
    "response": "organizer",
    "time": "0001-01-01T00:00:00Z"
},
"body": {
    "contentType": "html",
    "content": "***"
},
"start": {
    "dateTime": "2025-12-02T14:30:00.0000000",
    "timeZone": "India Standard Time"
},
"end": {
    "dateTime": "2025-12-02T15:00:00.0000000",
    "timeZone": "India Standard Time"
},
"location": {
    "displayName": "",
    "locationType": "default",
    "uniqueIdType": "unknown",
    "address": {},
    "coordinates": {}
},
"locations": [],
"recurrence": null,
"attendees": [
    {
        "type": "required",
        "status": {
            "response": "none",
            "time": "0001-01-01T00:00:00Z"
        },
        "emailAddress": {
            "name": "*** ***",
            "address": "***.***@[Moderator note: personal info removed]"
        }
    },
    {
        "type": "optional",
        "status": {
            "response": "none",
            "time": "0001-01-01T00:00:00Z"
        },
        "emailAddress": {
            "name": "*** ***",
            "address": "***.***@[Moderator note: personal info removed]"
        }
    },
    {
        "type": "optional",
        "status": {
            "response": "none",
            "time": "0001-01-01T00:00:00Z"
        },
        "emailAddress": {
            "name": "*** ***",
            "address": "***.***@[Moderator note: personal info removed]"
        }
    },
    {
        "type": "optional",
        "status": {
            "response": "none",
            "time": "0001-01-01T00:00:00Z"
        },
        "emailAddress": {
            "name": "*** *** ***",
            "address": "***.***@[Moderator note: personal info removed]"
        }
    }
],
"organizer": {
    "emailAddress": {
        "name": "*** ***",
        "address": "***.***@[Moderator note: personal info removed]"
    }
},
"onlineMeeting": null
}