"Please Try Again Later" error prompt occurs typically during the account registration process for a few reasons.
A common one is due to users sharing the same IP address over mobile (Network Address Translation, or NAT) which sometimes causes issues when trying to login to our servers. As the prompt says, the only remedy is to try again later with less network traffic, or over WiFi.
Another common reason is due to user requesting for verification too many times causing a temporary, usually no more than a few hours in duration, lockout.
Finally, if the user has entered a verification code, but due to poor mobile connection the process hangs, tempting the user to request a new verification code with the assumption the original code was rejected. If this is repeated more than three times in a short period of time, to maintain application integrity and security, the account will be locked up to 24 hours.