Borderlands 2 shift key redemption failed

Why will no code work. Even found one less that 10 min. Can you explain. If the explantion is well enough. It might explain why i wasted 3 hours tryin to get 2 keys…im not happy.

EXPIRES 28 OCT

PC: C3KT3-FKHSB-66JXC-BT3JB-XW9C5

Xbox: CBW3J-CWTHK-9HXFS-WXJTT-H5FRS

PS: KBCJ3-FCXZS-ZTKZC-ZBWBJ-RTXW6