I expect this is well known and has been reported.
If a player completes the new raid with a full emblem inventory, they will not recieve the new reward emblem for downing Crota.
I would have expected the item to be picked up in my mailbox but the item was not received. Please reward the player (whom has completed the raid) with the emblem in a future hot-fix update please.
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The Emblem is only a drop remember so maybe you just didn't earn it from the rewards