Transferring Windows 10 license to another PC- FAIL

I purchased a full retail Win 10 pro license and the product was delivered digitally. I did a clean install on the machine I was intending to use, but subsequently decided I did not want to use that machine because of it's age, so I purchased a new computer. I expected that I would be able to transfer the license to the new PC, but when I install it, and try to activate, I get activation error 0xC004C003. I've called Microsoft support several time, which has not fixed it. I removed the license from the original machine with slmgr.

Can anyone tell me how t his is supposed to work.

First, whom did you purchase the Windows 10 from?

On the new computer run:
slmgr /upk
slmgr /ipk insert-your-product-key-here
slmgr /ato

What is the result?

NavyLCDR said:

First, whom did you purchase the Windows 10 from?


On the new computer run:
slmgr /upk
slmgr /ipk insert-your-product-key-here
slmgr /ato

What is the result?

Windows 10 Pro (full retail version) was purchased from Newegg and delivered by download.
I ran the above and after the slmgr /ato, there is a message that says the product key could not be used. When I ran the diagnostic tool from the troubleshooting thread, it said "invalid license" and "OEM key not present in firmware".

ShowKey results:
ShowKeyPlus - Windows Product Key Information
Product Name: Windows 10 Pro
Version: 17134.228 (64-bit OS)
Product ID: Erased by me
Installed Key: As inputted by me
OEM Key: OEM key not present in firmware

ShowKeyPlus - Windows Product Key Information
Original Key: As inputted by me
Original Edition: Win 10 RTM Professional Retail
EULA Type: Retail

Make sure you are using the Check Product Key function:

NavyLCDR said:

Make sure you are using the Check Product Key function:

I did, and it returned my key.

And do you have Windows 10 Professional installed? What does slmgr /dlv return? You do NOT need to block any info in the return, none of it is unique to your Windows license: