Won the game, it was a very hard fought 50 minute 4v5 (we had an afk) BUT NO LP

If I could get an answer from someone who knows if LP will be rewarded to this game. We had an afk at around 10-15 minutes in and he could not log in due to server issues. They had their full 5 players the entire game to the very end of the 50 minutes. It took all our effort to win this 4v5 it says victory but we got no LP its been over 8 hours.

Please respond been waiting for quite some time.

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2226216935/229577087?tab=overview