If this happened to me I would change browsers and see if that changed anything. Does it make a difference if you attempt to claim it from chrome, Firefox or Internet Explorer?
Not saying it will change anything, but worth trying.
I passed this on to the team for discussion.
now i have tryed them all (firefox, IE, Edge, Torch) is thre any other browser i should try?
I was trying to progress in the nova event to receive the rewards, it went fine till the 3rd reward, but the 4th now isn't accepting to be received, I its showing me in the upper indicator in the top of the page as 4 rewards, and in the line of circles its only showing 3, what should I do to receive the 4th reward?