Only Reader that does not Support: https://www.heise.de/newsticker/heise-atom.xml
For some reason palabre is the only rss Reader for years now that does not https://www.heise.de/newsticker/heise-atom.xml rss feed. Every Single other rss Reader does not have any issues with that... But palabre since years.
I've already mentioned this issue on google+ a year ago or so and got ignored.
Add heise.de support!