Microsoft on-premises server product that runs Office Online.
Welcome to Q&A forum.
As your issue is related to license requirement, which is not supported on Q&A forum at current time.
I suggest you contact your Office sellers to have a confirmation.
Based on my knowledge, Office 365 is licensed on a “per user” basis, users need to log in with their own account to active the Office. Following image is from "Overview of shared computer activation for Microsoft 365 Apps".
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