Yes, German keyboard and German(QWERTY) keyboard both has a on the 2nd place of the 3rd row on keyboard (next to Caps Lock), the same location as on US keyboard.
But with the former reply, I intend to say, I also tested with other keyboard layout, and I can’t reproduce the problem, if you indeed set the admin password after setting the keyboard layout. To test, I 1) set the keyboard to another keyboard layout, and then 2) entered admin password, and the result is, the admin password I set is entered with the keyboard layout I set, instead of what it would be like using default keyboard layout (US). As a last measure, can you try reinstalling (including re-downloading) Tails on another USB disk, or try with another keyboard, and see what happens?