I am experiencing a issue on bungie.net's tracking system for MoT. The adventure's triumph isn't tracking any progress completed after the feature was introduced some time ago. Me personally, I'm stuck at 17. Being a completionist, this really ercks me, because I can't physically earn 400 points for the final prize.
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MoT tracks the character that you have completed the most triumphs. Log in to that character and complete the Adventures to see progress. To help you track what you're missing and on what character, search your account name on https://d2checklist.com