More than a Weapon is the seasonal quest line.
Every week you need to complete a few steps, typically, do a Heist Battle Ground, talk to the Exo frame, visit the holo projector.
Rinse and repeat every week.
Look in your quests/missions tab, not your seasonal challenges tab. Typically the first step is open a seraph chest.
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I've never had a holo projector to play in this section of the game. I always approach it but it never indicates it has anything to share with me.