1. The reason why the display format is incorrect when entering the CDK redemption code in the Peace Elite CDK redemption interface is that the player does not distinguish between upper and lower cases of English letters. Players only need to strictly distinguish the case of letters and fill in the official exchange code for players.

2.CDK redemption codes are generally composed of numbers, letters and symbols, but when we input redemption codes, we often ignore the case of English letters, which will lead to incorrect format prompts and failed redemption.

3. Re-acquire the exchange code.