To all the folks complaining about not being able to make an account, if you don't have the patience to wait 19 days to make an account, how do you think you'll have the patience to test for bugs? Seriously... If the goal of PBE for all the newcomers is simply to play a new champ/reworked champ, then you aren't joining for the intended purpose of the PBE.
Many posts on here describe this as a punishment to new players. Bug testing requires a keen eye, patience, and the maturity to handle imperfect situations, qualities that are usually lacking in new players. Being aware of how the game environment, champions and skills are intended to work and interact with each other is necessary to be of use on this server.
Unfortunately the PBE is plagued with leavers, trolls and generally immature players. in the next few weeks, hopefully those players will be weeded out or at the very least thinned. Sure, they can make new accounts next month, but if they do the behavior again, they will be kicked out again and have to wait another month to do so again. If trolling is really worth all that effort for so little a return, let them waste the time.
19 short days is all that you have to wait in order to be a member of the community. Be patient, buck up, and we'll see you in September!
TL;DR: Be patient, its what PBE is about. The wait is worth it for those who really want to help the community and do some serious testing.