MMRHC
You probably want it running as a logic app rather than power automate as it's then not tied to a specific user account. Last I checked, Logic Apps are able to natively pull user details using the Azure AD connector. You'd then submit a HTTP GET/POST request against the ITFlow API for each user within the Logic App.
We did this at a previous business for Snipe IT. The core idea is the same so I'm pretty sure it'd work. Sadly, Microsoft took away my free dev tenant so I can't test or provide useful examples of the Logic App side anymore.