Hi @Bourgeois, Philippe (Services)
Welcome to Q&A, I would like to help you, but your issue is related to Office license agreement, such license issues are beyond the scope of forum support.
I suggest you contact Microsoft via phone for a confirm whether the license can be transferred to another account of yours.
https://support.microsoft.com/en-us/help/4051701/global-customer-service-phone-numbers
Thanks for your understanding.
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