Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
1
If you still have access to the old device that Office was installed on, open Word on that device.
Go to File - Account.
On that window, you should see the Email address of the Microsoft account you use for your Microsoft 365 subscription.
Then try logging into that account on this link to find your subscription and install Office on the new device from there.
https://account.microsoft.com/services/
2
If you are able to find the Email address of your Microsoft account, but have forgotten the password, try using the steps on this link to reset your Microsoft account password.
3
If you are still unable to resolve this problem, this forum is just a user to user forum, no-one here has any account access, you will need to contact Microsoft Support directly, 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