New Cordless Vacuum S won't charge

Just bought it from Walmart, and it doesn’t charge. Doesn’t even show anything on the display when I plug it in. I poked at the adapter with my multimeter and it does stuff, but I’m pretty inexperienced and don’t know if it’s doing enough stuff, you know what I mean? Can anyone tell me if what I’m seeing indicates the problem is with the adapter or not?
https://photos.app.goo.gl/uwo18qTEGb2ioqKf9 - video of testing it

I really don’t want to futz with returning it to walmart if I can get a replacement part (adapter? battery?) from Wyze, but I’d understand if my only recourse is walmart’s process.