Every clan has a set limit of requests that players can make in a period of time. When the limit is reached, every player who wants to join the clan would be receiving an error message. At the same time, the actual number of requests can be much higher than the number of clan members. You'll be able to make a new request only when the leader of the clan sorts out all of the current requests.
Anyway, you can always leave a request later or join another clan.
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