Forum Discussion
How to change primary user
Unfortunately, Microsoft does not allow you to simply “switch” the primary account holder on a Microsoft 365 Family subscription. The subscription is tied to the original purchaser's Microsoft account. The widow cannot make herself the primary on that subscription; instead, she would need to set up her own Microsoft account and subscription, then continue using her existing account as the main one going forward.
https://learn.microsoft.com/en-us/answers/questions/4669893/death-of-account-holder-how-do-you-change-details
Unfortunately, Microsoft does not allow you to simply “switch” the primary account holder on a Microsoft 365 Family subscription. The subscription is tied to the original purchaser's Microsoft account. The widow cannot make herself the primary on that subscription; instead, she would need to set up her own Microsoft account and subscription, then continue using her existing account as the main one going forward.
https://learn.microsoft.com/en-us/answers/questions/4669893/death-of-account-holder-how-do-you-change-details