Is Confirm object supported with Microsoft Edge?

I have a CloseBrowser function, that handle confirmation message.

When running my test on Edge, the Confirmation message is not handle

Object browser is seeing this:

Sys.Browser("edge").BrowserWindow(0).UIAObject("Popup_2").UIAObject("m_informationDialog").UIAObject("ContentScrollViewer").UIAObject("Leave_this_page")

I didn't read any limitation in documentation of Confirm object.

Is it a missing feature, a bug? or did I miss something

Thanks