Ok, maybe this will help someone else.
The app at this time does not do well when you try to create an account using email with the app when you first launch it. It is getting hung up on the account creation and never works through sending a confirmation email. If you first create the account on https://recipes.anovaculinary.com/ and run through the confirmation you can then use that account when you launch the application. If you a=have already gotten stuck on the white screen you have to uninstall the application and reinstall before logging in with an account you have confirmed on the url above.
Also, I believe you will need to have location turned on on the android device to get through the connection to the oven. Only one of my android phones was able to get the oven to join a network. The others clocked. Not sure why.