Why is the "Reserve" button not active?

If you you're not able to book a mission (the "Reserve" button is not active), this might be due to the following reasons:

• You previously reserved a mission, but did not complete it in time. It's therefore no longer available to you
• There's date and/or time restrictions for the particular mission you're trying to book
• The mission was booked by another Eye
• Two mission can be published for one location --> in this case, click on the mission and scroll down. Once you have reserved one of the missions, you can book the 2nd one as well.