Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
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1
If you have the Office apps installed on any PC, open Word, then go to File - Account, on that window, you will find the Email address associated to the Microsoft account used for the Office licence.
2
If you do not have access to a PC with the Office apps installed, log into any Microsoft account you may have on this link, do you find the Office licence listed on any Microsoft account you may have.
https://account.microsoft.com/services/
3
If you are still unable to find the Office licence linked to any account you have, this forum is just a user to user forum, no-one here has any account access, you will need to contact Microsoft Support directly, provide them with full details of your Office licence, they may be able to trace the Microsoft account 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