Finding OEM Key

I work for a computer lab that does a lot of licensed upgrades to Windows 10, usual  using Ghost and a complete(all drivers and the like)  Image to hasten the work (because we can get orders of 100's of computers at a time).  
Sometimes(1/3rd or 1/4th) when we go to check that everything worked the comperter doesnt reconginze the OEMkey from the bios and severale restarts doesnt help. 

we can use the phone serves to fix the issue but that takes up to 5 minutes per unit.
I have also found programs like that of NeoSmartSystems ( https://neosmart.net/OemKey/ ) 

But i would like to know if Dell has a licensed program  or an easy(fast) solution because i would rather not use a 3rd party program because it is less secure.