Hi there. If you haven't claimed the armor from your season pass while logged in with your Hunter, please do so. If you see it but it says you don't have space, you need to put some of your armor in the vault or dismantle them to make space. If you dismantled or infused the armor into something else, you can get more as random rewards from playing PsiOps activities or by exchanging Umbral engrams and materials at the War Table in the HELM. If you did not dismantle or infuse the armor you had, check your Vault and other characters to see if it was accidentally misplaced.