It appears that ECU might have cancelled the game since they announced the change and that they have picked up a game Campbell to replace the MU game at the same time. ECU also dropped the Boise series. I am hearing from ECU fans, I used to live in Wilmington NC that it was either a mutual decision or ECU wanted out of the final game. I think it was ECU that wanted to cancel the game.
"In addition to canceling the Boise State series, ECU has also added an FCS game against Campbell for the 2025 season. The Pirates will now open that year at NC State, host Campbell, and welcome BYU to Dowdy-Ficklen Stadium on Sept. 20. The game at Marshall, scheduled for that season, has been canceled. The Thundering Herd's trip to Greenville for the 2020 season, which was canceled due to COVID, will also not be made up."
ECU and Boise State have elected not to play their future football series, originally set for 2026 and 2028.
247sports.com
I would guess there is no payout since the 2020 game offsets the 2025 game. It tuns the series into a one for one instead of a two for two series.