The strength of memory challenge is "if a player has shot the same eye twice -> fail challenge".
To complete this challenge in previous seasons we would have 1 person on each side shoot both eyes on the bottom floors. Then have the remaining guardians who haven't shot any eyes shoot the 6 eyes at the top floor.
When doing this challenge today (18/11/2020) whenever we shot any eyes at the top floor it would fail the challenge.
Legit riven challenge is a well thought out challenge and I hope bungie can fix it so that the very few of us who still do legit riven can complete it as it was intended.
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Star and I have Duo'd Riven legit and Taught it, with challenge, to many people. I was not in the raid instance but trust entirely that it was being done correctly and should be investigated.