This guide will let you know how to fix the problem in Fortnite where you cannot Sprint. You have to follow the simple steps below to fix it.
You can quit the game, reboot the round, and sprint again. But if you want to fix it mid-ramp, you need to have your friend reboot, let yourself die to get rebooted, and then you’ll be able to sprint again.
Ensure your Fortnite has full control, and do not be playing on your second or third monitor while Fortnite is loading you into a round. You need to make sure Fortnite is the primary monitor.