Hey there, to qualify for their exotic reward, an individual character must complete all 14 Legendary missions. You have the Legendary missions split over two characters, which let you complete the triumph, but neither of them qualifies for the exotic yet. You've got The Invitation to Charge on Warlock, Quarantine to The Message on your Titan. If your Warlock plays Quarantine, Disruption, Calculus, Criticality and The Message on Legendary, they should be able to pick up their exotic from the Altar. However now you have completed the triumph, the exotics can drop for all characters from the post-campaign 'The Sieve' activity.