Playing the game from the editor as either host or client just doesn't work with built versions

[safe steeple]

What networking are you using? Have you tried with 2 editors with ParrelSyncor Multiplayer Play Mode? I would use In Game Console to be able to check for errors in builds

[zealous folio]

Sorry for the delayed reply, was a bit busy
I hadn't heard of parrelsync or multiplayer play mode so I'll definitely check those out. and yeah good point I should defo have used a console to check for errors on the build side