Non-persistent VDI devices not auto-deleting

Hi, I set the threshold to have SEPM delete non-persistent VDI connections to once every 2 days, but they're not being deleted automatically - I still have to delete them manually.

I wouldn't care if I was somehow able to hide these devices but every day I look at the Endpoint Status window on the Home screen and see 150 or more "offline" devices reported. I don't want to see any if they're not VDI clients.

Any advice?