Joining League restrictions

I logged out from league and I can't join a new league again why reason 

Hey eslamo87​ and d9bntimcgw3w​,

I merged your reports here to let you know there could be a cooldown timer to join a new league after leaving one.

Please try again later today or tomorrow, and let me know if you continue to get an error. 

Thank you for your patience with this.

I have message is error 200043 when I get into league