Hi RiggyPC,
Thank you for your question.
Windows 11 Digital License is generally not possible to activate on any other edition of Windows, for reasons of being different editions. However, imagine the following scenario:
You have windows 10 and want to upgrade to windows 11, windows 10 in your case is already activated, when the change to windows 11 occurs it will be activated, because the change occurred in an update and not an activation process, understand?
In addition, I recommend that you check the topic below, which will deal with licenses and other issues that can help you better understand the scenario:
https://answers.microsoft.com/en-us/windows/forum/all/frequently-asked-questions-windows-11/c97076fc-f361-44ec-9a01-33029ffaa987
If the answer is helpful, please vote positively and accept the answer.