Hey rapterforce122, I just tested .invsee, but it seems to working fine.
Remember that the target player needs to be within your render distance, you can't invsee people from far away or in a different dimension. Also, .invsee will not work if you try to use it on yourself, it has to be another player.
Does it work when you try to .invsee a player that is nearby and is not you?
