Find the Espn app and scroll to the bottom and look for SEC network+. If you have sec network you should be able to watch it there. I hope, cause thats where im at
Anyone asking - many of the game streams on the ESPN app do not start before their kickoff time. You sometimes can't even find it in the list of games until it goes live, at which point the game will become visible in the "Live" section of the ESPN app. If you don't see it, it's worth exiting and then going back into the app to force a refresh of live games listed.