It's not working for me either. I have used Revenant and Tether, made sure to have matching weapon types as well. I wiped an entire team with my Revenant and it didn't effect this at all.
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I ran it as Song of Flame for the "solar" in the description multiple games, still at 0%. Switched to Stasis to try that since maybe prismatic didn't count? But after running it as Shadebinder, still sitting at 0%...