Hey there!
The Season of Undying Badge as well as its Title were removed at the start of Season 9 as it was seasonal content. If you did not complete them, they are gone forever.
So your friend might have never turned in the Triumph for getting the Badge inside the Title and therefore got the message that it unlocked.
English
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This week Beyond Light launched and the Season of the Undying collections badge has reappeared in my collections. I did not complete the badge and it bugs me that it appears because now it is the only badge that I have incomplete and I can't do anything about it because it is no longer earnable. Is this a glitch or is Bungie just trolling their community?
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That was my original thought as well. But he managed to complete less stuff than I did on the badge. I think the only managed to acquire 7 items from Season of Undying. The badge also still shows up on the companion app which is honestly the only reason i know how much progress I made on it, which was 17/19.
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So I don’t know if anyone will see this as this post is from 2019. But as of today, I have only been playing 2-3 weeks (Season of Arrivals). I got the Season of the Undying collection badge today. While my husband who is sitting and playing right next to me, and also has 1 more item from the collection than I do, did NOT get the badge. He can’t even find the badge listed. It wasn’t listed for me either until I randomly got it. So I’m not sure what is going on, but this is the closest scenario I can find via google. So I figured I would share, because we can’t be the only ones.