Hello there, Thank you for your report. We've received reports of this issue and are investigating the underlying cause further. 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 any 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]News [/url]page.