Not sure if this helps anyone, but here’s my experience…
I noticed they updated the app, so after I downloaded the latest version of Wyze Car app, I tried to run it, but it wouldn’t connect to my camera. I went through the steps to try and add the car camera back into the app, but when I got to the QR code screen, nothing was there to scan, even after cycling the setup process a few times.
What worked for me is I did the following…
On the app side, I logged out of my account, uninstalled the app, reinstalled it, and connected it to my Wyze account.
After plugging the camera back in, I hit the camera reset button, and walked through the setup process again, and the QR code appeared this time. Everything was smooth sailing from there, and it even knew to download and apply a firmware update for the camera.
I hope this helps someone because I saw other people having similar QR code issues leaving comments on the Google Play store.