Official support for Switzerland / Liechtenstein
I know Switzerland / Liechtenstein are difficult because they are not part of the EU and so Amazon.de is not shipping some of products to those countries, because of taxes.
Give digitec.ch a try, they have a lot imported products in their online store and have experience with importing such (I know, they compete directly with Amazon:-))
You find information under https://www.digitec.ch/en/wiki/528
At least activate the country codes +41 Switzerland and +423 for Liechtenstein to create an account.