jdevereux3 is right in some respects. DJ's system doesn't show VS status on their boarding passes which as you found out might create hassles for you when using priority services not provided/managed by the carrier.
I do understand however that the DJ boarding system does pick up your VS status and make that information available to agents. This was what I understood after speaking with an agent on on a recent check-in at OOL. If this understanding is incorrect, I'd love to know more myself.
I asked about this as I was surprised why they'd not questioned me when I rocked up in the Priority check-in lane without my VS Gold card. It was also why she'd bumped me into the exit row without even having to ask or OLCI.
Sadly, that was the flight where I got stuck with a nervous & distracted flyer in my row, who wouldn't take the hint that I wasn't up for conversation and ended up crying after visiting the ladies and thinking that the crew were making light of her.
Extra leg room I like but unable to relax and enjoy it.