An "Expired Redemption" occurs When a reward was selected for redemption, but could not be presented or processed at the POS before the specified expiry time for the redemption code. If your business is fully POS-connected, you can choose via configuration to return unhonored rewards back to the Guest's wallet.
You can check the box "Return reward to the guest's account if redemption is not honored or if the redemption code expires?".
The path is (Dashboard-->Cockpit-->Redemptions-->Redemption Properties)
If your business is not POS-connected, these rewards will expire automatically after the specified duration.