Originally Posted by
Djokison
Easy fix.
Leave the country on USA instead of changing it to Germany. Pick a random state, and fill in the German address and city. The country doesn’t have to match the cards actual billing address, it’ll still go through.
I just wanted to second the advice given by Djokison. My credit card is issued by a Japanese bank and billed in JPY, but I have successfully ticketed an AA award flight online in this manner. Best of luck to the OP.