Unfortunately, the other layouts are missing the German umlauts (ä, ö, ü) as well as other language/region specific symbols (ß, €, °). The solution is the following keyboard-layout based on the U.S.

I was initially confused by iOS’ way of handling keyboard layouts. Hence, a quick tip. This is probably something that you already know about. If you do, feel free to close this page and forgive me; ...