Hello, are you guys using a windows computer? Or are you using mac? If you are using mac, as stated in numerous other threads, a mac-compatible client is being worked on, with no current ETA. Many players are turning towards virtual machines to run windows through their mac, which has resulted in some success, others are using sources such as the one posted below to login.

https://flash.puffin.com/https://naruto.oasgames.com/en/serverlist