Telekom Website→

At first glance, their policy looks good - sure, the upper limit was chosen without necessity and they enforce characters from all four groups, but your password manager will most likely come up with something suitable.

The website even tells you how 'wunderbar' your new password is - only to then throw up an error when you try to save it. The frontend and backend seem indifferent about certain special characters, such as \ " ' : ; ^ `