Hi guys I had this problem aswell. I sent Mordhau an email and they said they were aware and working on the issue. I tried reinstalling the game several times aswell as un-checking the DLC box on the steam client, none of these methods worked for me. Through playing around with the in-game Horde/BR customization screens I actually fixed the issue for myself and this should work for you guys as well.
Main Menu -> Armory (top left 2nd button) -> Horde/BR -> Armor (defult tab opened) -> Heavy -> You should notice some of the selection slots are missing for arms shoulders and more, Select Torso and even if you did not purchase a different torso than the default option, select the Crude Cuirass, then the missing armor tabs should appear. -> Select Shoulder and you should see your Medallion waiting for you there, and you can find your special banner available aswell.
Hope this helped! GL HF
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