@saguaros
I found the problem and I found a workaround for now.
The popup is missing when I use my standard Edge or Chrome browser which are both running in german language.
I've just changed the language to english in the browser advanced options of Google Chrome.
And to my surprise the popup now shows up.
So it seems that there are some checks or settings inside your code that do not work with a german based browser.
While waiting for a fix from you I will meanwhile use chrome in english.