Well, thats an easy solution! The PS Vita of course cause Phantasy Star Online 2 isn't compatible with the Vita TV!
http://www.dualshockers.com/2013/10/02/phantasy-star-online-2-wont-be-compatible-with-ps-vita-tv/
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850







