Windows 10: 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?

:)

 

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

 

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

Hi, I've purchased a free Windows 10 Education license from my university a year ago. Lately I've bought a new computer that came with Windows 10 Home pre-installed. I've tried to transfer my win10 education product key to this new computer
but I've forgot to deactivate the key at my old computer before traded it in, and now my new computer is in notification mode. Is there any alternative besides purchasing another education license?