The code is 4728, I think you need to apply then I can accept you - Please try to make it clear who you are (make your name similar to your CP handle) as some people outside of CP try to join by randomly entering league codes.
I too have sent the request. My team name is similar to the CP handle so shouldn't be tough to identify.
I can see that we already have few guys joined there. Need to see if @Abhinav-S or @Sandeep-Mewara will be joining or not this time.