VDBP Battery Not Charging

My VDBP battery doesn’t charge, even though it’s connected to existing doorbell wiring. There’s also no indication in the app that my VDBP is wired. I’ve confirmed that the wiring/power output meets the Wyze requirements, and I’ve measured the power to the doorbell. Everything looks good, but the battery isn’t charging. I now have to use USB charging to keep it working. Anyone have any ideas why it won’t charge.

UPDATE: I disconnected the wiring and charged the VDBP using USB. Then, I reconnected the wiring. Now the battery icon shows a plug on it, so I believe this problem is gone. I’m not sure why this fix worrked, but it did.