Still could not solve this issue. When I go to the help link, all I can do is read articles about the task funktion. But I cannot raise a ticket to the support team. That is quite annoying. I would love to get this issue solved. The task feature is even a paid feature and it is very sad that it is not working.
Please solve this issue and do not recommend me to go to the help section. I already did that and could not find the answer. I re-installed Evernote, I use the newest version.