You can only claim the Metal Key and Jewel Key on their specific day of release. You can check the schedule below.
- Monday - Metal Key
- Tuesday - Metal Key
- Wednesday - Jewel Key
- Thursday - Metal Key
- Friday - Metal Key
If you haven't claimed the key for that specific day, you won't be able to claim it on the next day.
Note: You may also obtain Keys in the Merit Exchange Hall if you wish to have more keys other than the free keys provided daily. Be sure to have enough merit points to exchange for your desired keys. If you want to know more about the maximum numbers of keys you can redeem, you can check out our article here.