Hi @Danot
Sorry to hear you are having trouble. I verified everything is set up correctly on your account. I was not able to test this particular app, but it looks like it does support authenticated feed.
There must be an error with either the URL, username or password. I would remove the subscription and try again. An error I made when I first tested the feed was I forgot to include the “t” in “tkks”. Here the feed URL is again for your reference: