Appalachian State’s first year of FBS play would come in 2014 as a member of the Sun Belt Conference. However, per NCAA rules, the Mountaineers would not be eligible for the FBS post-season until 2015. The first game of App State’s inaugural FBS season was a rematch of the 2007 Appalachian State vs. Michigan football game.
https://en.wikipedia.org/wiki/Appalachian_State_Mountaineers_football