How to reactivate server 2012 R2 after uninstalling product key

R

Rob_a_Dog

Hello,

I had a brain fart and deleted the product key on a client's server (2012 R2) and need to reactivate it. The problem is, there doesn't appear to be a product key documented anywhere. I don't even know if it's an OEM license or if it's volume license as the company who initially set it up no longer exists.

Will restoring from a system state backup reinstate the product key?

I have restored the system state to a file from which I've been able to use a third party tool to read the registry. That produced a product key which I tried, but the activation didn't work.

Any ideas on how I can reactivate this server?

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