Are you saying it didn't use the cameras or it didn't align the cameras?
If it didn't align the cameras, David already pointed out the possible reasons but something I found to work many times is to select the cameras that didn't align and reset the alignment and then align only those cameras again. That way you might get a few of those cameras to align correctly, then repeat the process for the rest of the cameras, and repeat as many times as needed.
I got to align 16 cameras that were not aligned before, little by little that way and it worked pretty nice.
Leo