Windows 10 Activation after previous activation

I'm in a Windows Domain environment and I have about 150 PC's,  All windows 10 and activated.
I'm in the middle of a software upgrade which required us to reimage all the PC's because of the large software change and needing to completely remove old software from the environment.
Some of my PC's will not activate.  I click the troubleshoot button on the activation screen and it returns a confirmation that windows is activated.  When you ok that blue screen the screen behind it says.  we can't activate Windows on this device right now. You can try activating again later or go to the Store to buy genuine Windows . error Code: 0xC004F034
I think this failure to activate is because the machine was previously activated, but it is not happening on all machines.
These Windows 10 machines are HP Prodesk 600 G1 and some G2 .  
Any brand new Prodesk G2 activates without issue.
EkuskowskiAsked:
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JohnBusiness Consultant (Owner)Commented:
If the machines came OEM with Windows 10 and were running Windows 10, then the licensing is in the Microsoft Licensing server and that should work. Take one of the troubled machines, reimage again and activate.

If the licensing was volume licensing, you may wish to contact Microsoft Support.

And, you should not switch licensing. Leave OEM as OEM (or wipe totally clean and re-do as volume) and leave volume licensing as is.
Shaun VermaakTechnical SpecialistCommented:
Please run this for an elevated command prompt
slmgr.vbs /ato

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EkuskowskiAuthor Commented:
I have used  Shauns solution now on 3 computers that were not able to activate and they are now activated.  I'll have to look up what the /ato switch is doing but for me it is resolving my issue.
My license is a volume license and my next step was going to be calling Microsoft support. but the /ato is working
Thanks All
Shaun VermaakTechnical SpecialistCommented:
Glad we could help.

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JohnBusiness Consultant (Owner)Commented:
@Ekuskowski - Thanks and I was happy to help.
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