They key should be present in the bios and Windows would use that. Maybe try and read the key using an app and enter it in?
Chris | Admin
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I tried an app called produkey and entered the key but get the same error. Windows gives you the last 5 characters of the key it is expecting but it doesn’t match the one I extracted with the app. I wonder if this got messed up when I previously reflashed bios, but Windows was still activated and I used it for months after that.