TeamsActivity.Send

const options = {
	authProvider,
};

const client = Client.init(options);

const sendActivityNotification = {
    topic: {
        source: 'entityUrl',
        value: 'https://graph.microsoft.com/v1.0/chats/{chatId}'
    },
    activityType: 'taskCreated',
    previewText: {
        content: 'New Task Created'
    },
    recipient: {
        '@odata.type': 'microsoft.graph.aadUserNotificationRecipient',
        userId: '569363e2-4e49-4661-87f2-16f245c5d66a'
    },
    templateParameters: [
        {
            name: 'taskId',
            value: 'Task 12322'
        }
    ] 
};

await client.api('/chats/{chatId}/sendActivityNotification')
	.post(sendActivityNotification);

Import-Module Microsoft.Graph.Teams

$params = @{
	topic = @{
		source = "entityUrl"
		value = "https://graph.microsoft.com/v1.0/chats/{chatId}"
	}
	activityType = "taskCreated"
	previewText = @{
		content = "New Task Created"
	}
	recipient = @{
		"@odata.type" = "microsoft.graph.aadUserNotificationRecipient"
		userId = "569363e2-4e49-4661-87f2-16f245c5d66a"
	}
	templateParameters = @(
		@{
			name = "taskId"
			value = "Task 12322"
		}
	)
}

Send-MgChatActivityNotification -ChatId $chatId -BodyParameter $params

# Code snippets are only available for the latest version. Current version is 1.x
from msgraph import GraphServiceClient
from msgraph.generated.chats.item.send_activity_notification.send_activity_notification_post_request_body import SendActivityNotificationPostRequestBody
from msgraph.generated.models.teamwork_activity_topic import TeamworkActivityTopic
from msgraph.generated.models.teamwork_activity_topic_source import TeamworkActivityTopicSource
from msgraph.generated.models.item_body import ItemBody
from msgraph.generated.models.aad_user_notification_recipient import AadUserNotificationRecipient
from msgraph.generated.models.key_value_pair import KeyValuePair
# To initialize your graph_client, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=python
request_body = SendActivityNotificationPostRequestBody(
	topic = TeamworkActivityTopic(
		source = TeamworkActivityTopicSource.EntityUrl,
		value = "https://graph.microsoft.com/v1.0/chats/{chatId}",
	),
	activity_type = "taskCreated",
	preview_text = ItemBody(
		content = "New Task Created",
	),
	recipient = AadUserNotificationRecipient(
		odata_type = "microsoft.graph.aadUserNotificationRecipient",
		user_id = "569363e2-4e49-4661-87f2-16f245c5d66a",
	),
	template_parameters = [
		KeyValuePair(
			name = "taskId",
			value = "Task 12322",
		),
	],
)

await graph_client.chats.by_chat_id('chat-id').send_activity_notification.post(request_body)