Welcome in the forum, Daniel.
I just checked out the configuration and it seemingly does work as expected. See attached project.
Did you scope your input clock?
PS: Where in Germany are you located? I live near Bremen.
Hello odissey, hello Bob,
thanks for yur quick answers.
Thanks to Bobs example I found the failure. I didn't activated the Input buffer for my clock Pin.
Now it works. Thanks a lot! :-)
I live in Ulm