Purchasing Windows OEM keys

[Blyss73usa]

I own a small consulting company where I provide IT support for small businesses. I have a customer that wants me to upgrade about 30 workstations, motherboard, processor, ram and hard drives so that the systems can run Windows 11. I purchased an OEM Windows 11 DVD from Newegg and after upgrading the first workstation, I attempted to install Windows 11 from the DVD. When I entered the Product Key, I got a message that the key was invalid. After trying several different methods, slmgr /ipk installing without the key and adding the key once it was online, I called Microsoft activation support. T

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