So, I have opened quite a few of timer boxes and when I opened it, an error will pop up saying "Invalid Timer Box". It will disappear and you will get no rewards from it. I opened a July Timer Box but when I opened them I got the error. Closed Pimd and opened it again but the timer box was gone, didn't even received a single dn (
Try contacting support. I haven’t had this issue before personally, but they’ll likely be able to help you.