We'd like to do a tour of Allianz Arena when we are in Munich. I am confused about ordering tickets online. When I go to the online ticketshop site (fcb-erlebniswelt.de/en/…index.php) the calendar doesn't show any available dates for tickets. I can switch to "voucher" and add to the shopping cart but then it doesn't specify a date. Is the voucher what I want to buy? I did notice that the link from the Allianz Arena website links you directly to adding a voucher to your cart so that does make me think that's what I'm supposed to do. I didn't want to purchase vouchers and then find out the date I need is sold out. Has anyone done this before?