Yes this is what bungie told me Thanks for reaching out! If you haven’t acquired all of the Motes of Light yet, make sure you’ve collected and placed all Visions of the Traveler and defeated all Overthrow bosses in each area. If you’re only missing the defeat of the Taken Servitor boss, we suggest you try to eliminate it a couple times, making sure to return to Orbit between attempts. Please note, we’re currently addressing an issue where the triumphs tracking the defeat of Overthrow bosses are not working as intended. Therefore, please don’t rely on these Triumphs as confirmation of your successful defeat of all unique Overthrow bosses.