Double XP Doesn't Work for the Daily Challenge?

I have the final challenge about ready to complete, I figured I’d activate a double xp boost to get a bit extra from the daily challenge, but I still only get 50 xp? I also finished the final weekly and only got 400xp from it. Is it bugged? Or is it granting double progress to complete a challenge?

2xp worked for my Ultimate challenge as well as works for my dailies.

Yeah one bit of feedback for 343 would be updating the UI to show “2x” in a soft yellow next to challenges in the exit screen with a total. I found myself double checking the math here and there.

So glad I didn’t waste double XP trying to get 100xp out of the daily.