After today's update, I checked the 2nd chance option in the C-store buyout tab, and it told me I could get another T6 coupon. Upon clicking, I lost the requisite Zen, but DIDN'T get the coupon.
I suspect your PROGRESS was advanced to 3000 of 3000; yet you forget to CLAIM the coupon. It's a common mistake because people expect the coupon to automatically appear.
Hit U for Character Sheet
Click on the REPUTATION (tab) where the older EVENT was shown.
Click on Event (tab) to show the old Event.
Then you'll see a CLAIM button to pickup your coupon.
Comments
I suspect your PROGRESS was advanced to 3000 of 3000; yet you forget to CLAIM the coupon. It's a common mistake because people expect the coupon to automatically appear.
Hope that helps you out!