I've had this three times now playing Kislev. Win the match and at end it says 'Friendly Match' in top left, gives no money or SPPs but simply gives you the back option. Going back to the lobby shows that the same match still needs to be played so no progress can be made..... very frustrating.
First time I may have used a pause period but other times no, played straight through. Big difference in starting value so may be related to draw-down issue of opposing team as they are selecting around 450 coins worth of enhancements.
Obviously this has put me off of playing the Eternal league as it feels like a waste of time