The future lighting isn’t live at the moment, if your lighting isn’t working when in-game it’s only studio at the moment.
There’s been different notes coming out on the thread including updates and such so it’ll probably be coming sooner then ever you should keep an eye on the announcement thread, and see when Roblox fully releases the new technology lighting source to the public so it’ll be seen in game and not just studio itself: Future Is Bright: Phase 3 Studio Beta.