Have successfully completed this challenge now 3 times but when I get out of the match it shows that I have no progress on it. Guess I will leave it alone until they fix it.
This has been already reported and it's under review. Thank you!
can confirm, just completed it a second time and the progress says 0/1 on the post-game tome popup (as opposed to the expected 3/3)
at least im not the only one experiencing this
its just a bug on pc...on console they can do it.
@Mandy Look here