Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
1
Are you able to log into your Microsoft account on this link to download and re-install Office from your account.
https://account.microsoft.com/services/
If you are able to log into your account and your Office licence does not appear on your account, where did you get the Office licence.
2
If you are not able to log into your Microsoft account, are you able to use the account recovery form on this link to try to recover your account.