Your email is mostly clear, but I would recommend a few adjustments for grammatical accuracy and clarity. Here is a revised version:
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This email serves as a follow-up regarding the issue you experienced while redeeming the Gift Card Code NABRDRZMKPWX2QQV. After conducting a thorough review, we confirmed that the code has a value of $100, which you successfully redeemed on August 14, 2024, at 11:46 PM UTC. This amount was applied to your