@Didier Cauberghe
According to your description, do you mean that the email account used to redeem Office 2019 Home & Business is wrong, and you want to transfer the license account of Office 2019 Home & Business to be another acount?
If my understanding is correct, I would suggest you contact Microsoft online or on phone for a confirm.
Since the question is about the license agreement and requirements, which is not supported on Q&A forum.
Another reason is I find the similar threads below, some users who encountered the same issue try to contact Microsoft for help.
Office 2019 transfer license to new MS Account
How to transfer office activation to another account?
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
Hope the information could help you.
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