Back items do not show if there’s an item over it temporarily, like for example a sheathed shield or an engineer weapon kit (weapons like greatsword, rifle, staff and both types of bows do not block the visuals). Is that the case for you?
PS. The strap is essentially just for characters who don’t have a back slot item yet, they can just apply the skin to the straps and Bob’s yer uncle.
PPS. I trust you didn’t select to apply it as a PvP skin, in which case it will only show up in structured PvP. It does warn you of this when you try to apply the skin to something, so I’m sure that’s not what happened.
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