OTRS/Znuny 7 notification after creating ticket via REST-API

I'm using the OTRS REST API to create tickets in OTRS/Znuny 7. The ticket creation process is successful, but the subscribers of the respective queue do not receive any notification about the new ticket.

Interestingly, when I create a ticket via email, the subscribers do receive a notification. I have also made sure that the "NoAgentNotify" field is set to 0.

My question is: Are there any other fields or settings that need to be configured in order to trigger a notification for the queue subscribers when a ticket is created via the REST API?

Request body

{
	"Ticket":
	{
		"Lorem ipsum",
		"QueueID": 35,
		"StateID": "new",
		"Lock": "unlock",
		"Priority": "3 normal"
	},
	"Article":
	{
		"CommunicationChannel": "Email",
		"From": "foo@bar.baz",
		"Subject": "Lorem ipsum",
		"Body": "Lorem ipsum dolor sit amet",
		"ContentType": "text/plain; charset=utf-8",
		"NoAgentNotify": 0
	}
}

To trigger the NewTicket-Notification you must add a specific HistoryType to the article.

{
    "UserLogin":"root@localhost",
    "Password":"root",
    "Ticket":{
       "Queue":"Raw",
       "Title":"Test Ticket",
       "State":"new",
       "Priority":"3 normal",
       "CustomerUser":"customer-1"
    },
    "Article":{
        "CommunicationChannel": "Email",
        "From": "Znuny System <znuny@localhost>",
        "Subject": "Lorem ipsum",
        "Body": "Lorem ipsum dolor sit amet",
        "HistoryType": "EmailAgent",
        "ContentType": "text/plain; charset=utf-8"
    },
    "Attachment" :     
}

The HistoryType musst match the RegEx in this snippet that controls this specific notification (EmailAgent, EmailCustomer, PhoneCallCustomer, WebRequestCustomer, SystemRequest).

if (
        $FirstArticle &&
        $Param{HistoryType}
        =~ /^(EmailAgent|EmailCustomer|PhoneCallCustomer|WebRequestCustomer|SystemRequest)$/i
    )
{

You must also add "ArticleSend": 1, to send this article as an email if that is what you want to do.