Grimoire of Gold doesn't apply to rally event

I tried to use the 1 hour gifted Grimoire of Gold (from Mirt’s daily reward) to see if it applies to Rally event. I ran fast through room 15 and 50 in less than one hour and opened all the chests. But I think the bonus didn’t apply to any of the chests (last one, the purple, gave 5k ish gold, like alway).

[Edit] I guess because Rally events aren’t Challenges, stupid me.