8x8 is currently investigating issues with some customers having new logins fail when utilizing two factor authentication via email or SMS. Users are instead being directed to blank screen. Other authentications methods such as 3rd party Single Sign on are operating normally. 8x8 has resources engaged and will provide updates as they become available. 

8x8 has resolved the issue causing the logins failures with two factor authentication.  8x8 is monitoring and investigating the root cause and we apologize for the inconvenience.