RSS Feed not valid


New Member
Hello over there,

I tried to setup an app, and I fail integrating a rss-feed. I allways get an error:
Feed url is not valid, make sure the url is point to RSS or Atom feed(s)

The Link to the feed is . Tried to click the URL and it opens. Used it in two different rss-readers and there it worked.

Another feed from the same site e. g. works with AppYet with no problem.

I just can't find any difference or mistake I make.

Any Ideas?
Thanks and have a good night