Sounds to me you guys need to get some stock ROMs and flash the phones in order to rid of the dreaded FRP lock on them.
Only then will it work, in 7.1.1 they made it so "Build Number" is not even an option.
It was only until I was able to find the stock ROM I was able to even see it.
With flagship company phones it's much easier.I had a Treswave TW801 and I had a hell of a time. Good luck lmao.
-News,
So I dug around with an app called "Shortcutmaker" or similarly named and discovered it's definately what
@Jfalls63 had said, so my previous statement is the only way unless you can get the email and pass for the "Owner", in other words... Google sucks.
-Good morning, I have NEWS everyone,
There is an app you can download, on a PC ofcourse, that will bypass this issue, simply called "Developers options" it will be the same as if you could actually access it.
Just put the install.apk on an SD card, install it, and open it.
Cheers.