@Steve-Jones thanks dear Steve jobs (oops!) Jones . i found this after one day challenge with bomberRTT sample ! i think its better to say somewhere this important note that " developer plan" needed to lunch RTT games. p.n: i build this project in platforms pc / webgl / android in unity2019.1.5 pro. Android version not worked in my android phone (android9 os). something wrong that cause app install but not available to play!