Completed Vox obscura on master as the triumph listed. Didn’t receive it. Got the dead messenger catalyst from the mission so I do have proof
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As this seems to resolve a ton of issues: You can try clearing your console cache (power it down, pull out the power chord, wait ~5 mins, put it back in, restart) and try again, this time recording the end. If it works, good for you, if it doesn't you can then provide proof to support your claim.