Windows 10: Windows 11 Pro product key does not work

I Bought a Windows 11 Professional product key off a reseller and when i put it in the change product key section in my settings it said the product key does not work, i tried contacting microsoft support and nobody answered and none of the forums address this issue.

:)

 

Windows pro product key re-usability

This is an informative question regarding the policies of windows. I have an existing Microsoft Windows Pro software installed on one of my devices, I wanted to know if there is a way using which I can use that product key on my another device which has
Windows home installed in it, to upgrade it to Pro. If the policy requires the earlier existing system(with windows pro) to be abandoned or removed in order to allow the product key of pro to be used in a new system, that too works for me.

Please help me by suggesting me steps to take.

Thank you

 

Home to Pro Key not working

https://support.microsoft.com/en-us/...ng-home-to-pro

Upgrade using a Windows 10 Pro product key To upgrade from Windows 10 Home if you have a Windows 10 product key:

• Select the Start button, then select Settings > Update & security > Activation.
• Select Change product key, and then enter the 25-character Windows 10 Pro product key.
• Select Next to start the upgrade to Windows 10 Pro.

 

Will Windows 8.0 pro upgrade key work?

The answer to that question is yes it will activate Windows 10 Pro. What it won't do, though, is trigger an upgrade from Windows 10 Home to Pro.

1. Install Windows 10 Pro - not activated. Enter Windows 8/8.1 Pro upgrade product key. It will activate.
2. Install Windows 10 Home. Change product key. Here a Windows 8/8.1 Pro upgrade key (and any Windows 7/8/8.1 Pro product key) will be rejected. Instead enter the Windows 10 Pro generic product key and the upgrade to Pro will be triggered. Now you have a non-activated Windows 10 Pro installed. Change product key again, enter the Windows 8/8.1 Pro upgrade product key and it will activate.

Now - this is all assuming that the Windows 8/8.1 Pro upgrade product key has not been blocked from automatic activation. What I don't know is if phone activation will work in that case - or if the user must actually install Windows 8/8.1 Pro and activate it via phone first. My Windows 7 product key (good for 3 license family pack) has been blocked from automatic activation and I have to call the recorded phone line every time.