I flawlessly beat Trials of Osiris, but when I went to The Lighthouse and opened the chest I didn't get my emblem. I checked my emblems and saw that they were full. After going to orbit I checked my post master, desperate my emblem would be there but it wasn't. So I went on another flawless run through the trials and went to the chest again, but I didn't get anything. :(
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I have the same problem, seems there are a bunch of people in the same boat