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When participating in online contests like the Lemon8 Summer Stamp Card challenge, understanding the redemption rules is crucial to ensure you can claim your prizes without issues. According to the contest information, prizes are awarded on a first-come, first-served basis, meaning that even if you complete all required tasks on time, prize availability might run out if others redeem faster. Moreover, there is a redemption frequency limit—each user can only qualify to win once per prize. If the system shows a message such as "Reached redemption frequency limit," it means that you have already claimed that particular prize or that there is a cap on how frequently you can redeem it. To avoid these common pitfalls, it is recommended to regularly check the remaining stock of prizes and redeem promptly once qualified. Posting consistently, as encouraged by making two posts per day to collect stamps, increases your chances of earning enough points to redeem exclusive prizes like the Lemon8 Air Sofa. Also, take note of system notifications and error messages during redemption attempts for clues about the status of your eligibility. If you experience persistent problems despite meeting all criteria, contacting Lemon8's support team with detailed information about your challenge participation and the error message may help resolve account-specific or technical issues. Staying informed about contest rules and timely action can greatly enhance your reward redemption experience in Lemon8's exciting summer contests.