How to listen to ticket change

How to listen to ticket change

Hello community,
I created a widget, which checks all departments, if the user has written there as well, as some customer do this.

Overall it works fine, except that I have to refresh the widget tab every time I go to another ticket. How can I listen for that "ticket change" event? I tried App.on and ZOHODESK.Event.on, but only get the error, that both are not a function:

  2.         //Wait until SDK is loaded
  3.         ZOHODESK.extension.onload().then(function (App) {
  4.             // First loading (works)
  5.             loadTicketData();

  7.             // Here I get the error
  8.             App.on("Ticket_Changed", function (data) {
  9.                 loadTicketData();
  10.             });
  11.         });
Attached I send you the full widget file. Any help is much appreciated!

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