show you how to remove key cover to access key slot also how to get replacement keys from eBay and cut and program by automotive locksmith in your area. parts may not say 2021 but thy do work on 2021 Kia Put part number in ebay seach bar. part number for key fob
PART Number: 95430-M6000 cost about $54.95-up
Key Blade for Flip Remote part number 81996-M6100 cost $8.95-up
good luck!!