Hi there, Thanks for reaching out. We have received reports of what you're experiencing with the Mythic Missions triumph. As per our [url=https://help.bungie.net/hc/en-us/articles/39007140765204-Destiny-2-Year-8-Known-Issues-and-Vital-Information]Known Issues[/url] page: [quote]Mythic Campaign missions are sometimes not granting players Triumph progress when other members of the fireteam are at different campaign completion states. Players should ensure that they have unlocked the mission they are attempting to complete at higher world tiers in their own playthroughs prior to running them.[/quote] For potential updates on this issue, we recommend viewing our Patch Notes as they become available, posted on the [url=https://www.bungie.net/7/en/News/Destiny]News [/url]page.