VirtualAppointmentNotification.Send

const options = {
	authProvider,
};

const client = Client.init(options);

const sendVirtualAppointmentReminderSms = {
    attendees: [ 
        {
            phoneNumber: '+13129224122',
            timeZone: 'Pacific Standard Time'
        },
        {
            phoneNumber: '+1242421412',
            timeZone: 'Eastern Standard Time'
        }
    ], 
    remindBeforeTimeInMinutesType: 'mins15'
};

await client.api('/me/onlineMeetings/MSpkYzE3Njc0Yy04MWQ5LTRhZGItYmZi/sendVirtualAppointmentReminderSms')
	.post(sendVirtualAppointmentReminderSms);

Import-Module Microsoft.Graph.CloudCommunications

$params = @{
	attendees = @(
		@{
			phoneNumber = "+13129224122"
			timeZone = "Pacific Standard Time"
		}
		@{
			phoneNumber = "+1242421412"
			timeZone = "Eastern Standard Time"
		}
	)
	remindBeforeTimeInMinutesType = "mins15"
}
# A UPN can also be used as -UserId.
Send-MgUserOnlineMeetingVirtualAppointmentReminderSm -UserId $userId -OnlineMeetingId $onlineMeetingId -BodyParameter $params

# Code snippets are only available for the latest version. Current version is 1.x
from msgraph import GraphServiceClient
from msgraph.generated.users.item.onlinemeetings.item.send_virtual_appointment_reminder_sms.send_virtual_appointment_reminder_sms_post_request_body import SendVirtualAppointmentReminderSmsPostRequestBody
from msgraph.generated.models.attendee_notification_info import AttendeeNotificationInfo
from msgraph.generated.models.remind_before_time_in_minutes_type import RemindBeforeTimeInMinutesType
# To initialize your graph_client, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=python
request_body = SendVirtualAppointmentReminderSmsPostRequestBody(
	attendees = [
		AttendeeNotificationInfo(
			phone_number = "+13129224122",
			time_zone = "Pacific Standard Time",
		),
		AttendeeNotificationInfo(
			phone_number = "+1242421412",
			time_zone = "Eastern Standard Time",
		),
	],
	remind_before_time_in_minutes_type = RemindBeforeTimeInMinutesType.Mins15,
)

await graph_client.me.online_meetings.by_online_meeting_id('onlineMeeting-id').send_virtual_appointment_reminder_sms.post(request_body)