Open form in a dialog

Forms SharePoint Online
3

@Margo

This is the same topic (and code line) as mine.

I tried now to resolve it by opening the form in a showModalDialog manually like Alex and get the same wrong behavoir and error like before.

<script type="text/javascript">
function createNewTicket(){
	var pageUrl = "https://url/Lists/Tickets/NewForm.aspx";
var options = { url: pageUrl, width: 700, height: 600};
SP.SOD.execute('sp.ui.dialog.js', 'SP.UI.ModalDialog.showModalDialog', options);
}
</script>

<input type="button" id="newticketbutton" onclick="createNewTicket()" value="neues Ticket" />

So which is the right URL to open a Plumsail form correctly?

Edit: I also tried the url https://url/SitePages/Tickets/NewForm.aspx (i found the NewForm.aspx here as file)