Some update from Wyze support.
“The QR code issue with the Wyze Doorbell is caused by an authentication bug with out servers. We are working on a fix but the deployment would not be available until this Friday or Saturday.”
That’s interesting. I also looked through my router logs and discovered that DHCP assigned IP address to the doorbell’s MAC—which means it actually connected to router successfully, and something else failed, the QR code incorrect message was just a red herring. I guess we will find out this Friday.