First of all, it may be because of network connection problems, it is recommended to try to reconnect to the network or change the network environment and try again.
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Secondly, it may be because of system failure or incompatible game version, it is recommended to update the game version or contact customer service for a solution.
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Finally, it may be because the personal account or the event participation conditions do not meet the requirements, it is recommended to carefully read the rules and conditions of the event to ensure that your account meets the conditions of the prize. If the above methods are ineffective, it is recommended to contact the game's official customer service for a specific solution.