Multiple Windows License Keys Not Working

[Microsoft Windows]

Recently, at the MSP I work for. I had to reimage multiple computers with a fresh install of Windows 10 Pro on new M.2 SSD. My boss wanted me to use the Windows Keys off the old M.2 SSDs. I wrote the license key down from the previous image to use for the reimage. I used the slmgr /upk to remove the license off the old M.2 SSD Windows 10 Pro.. On the New M.2 SSD, when the image was done installing, it prompted me to put in the license key. When I went to put the Windows 10 Pro license key into the freshly installed image, it came up with an error code. I need a way to give Microsoft support th

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