Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
There is no method provided to move an Office licence from one Microsoft account to another account, this forum is just a user to user forum, you will need to contact Microsoft Support directly, provide them with proof of purchase and ask them to move the licence for you, try using this method to contact their support.
Go to this link: https://support.microsoft.com/contactus
Select Microsoft 365
Click 'Get Home Support'.
In the box provided, type billing.
Press Enter, then on the next page, scroll down and click 'Sign in to Contact Support'.
Navigate to Microsoft 365 and Office - Manage my Subscription.
Select the 'Chat with support agent in web browser' option