Does you computer see them as exFat or Fat32?
Windows 10 doesn't natively format to Fat32 anymore, it was superseded by exFat.
There are many programmes that can still format to Fat32 though, like partition magic, etc.
Yes, as long as you formatted on the B2 from new, it'll definitely be formatted in Fat32.
If you had of formatted on a PC to start off with, the B2 probably wouldn't of recognised the drive.