Windows 10: unable to move Windows product key from old deactivated computer to new computer

I purchased 2 Windows 7 licenses many years back in physical form and have been able to continue using them through several computer upgrades/replacements through Windows 10. In fact, I still have the physical box, disc with shiny holographic print, and license key printed on an orange sticker on cardstock.Anticipating the upcoming Windows 10 EOL, I put together a new NUC computer and tried to move the product key over to a fresh instance of Windows 11. Windows activation failed with: "We can't activate Windows on this device because you don't have a valid digital license or product key. If yo

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Deactivating Product Key on Old Computer to use on New

I recently inquired a new computer that is extremely faster than my old one. (i am using Parallels on Mac's)

I supposedly deactivated the product key on my old computer, (it said that it successfully deactivated). On the new computer, when I enter the product key it says it has already been used on a different computer.

 

Forgot to deactivate old computer's product key before transferring the product key to another computer

Actually I changed my laptop and forgot to deactivate old computer's product key before transferring the product key to my new computer.

However, immediate after installing on new device I deactivated it from the old device. at the moment no product ID is activated on my old laptop.

is there any problem now? what will happen? I am so concern

 

Intalling office 16 with product key on a new computer and deactivating on the old one?

I have a product key for office 16 and it was installed on my old computer. I'm tring to install it on my new windows 11 computer, says it is already installed on another computer. How do I deactivate it on my old computer and add it to my new one?