Thanks for the response.
That api requires a scope of ‘user:master’ which comes with its own requirements to even acquire.
Still hoping to get an answer to the scenario when an Account-level oauth app is installed in a Master Account, and then the api endpoint /users is hit, will this return only users in the master account, or also users in subaccounts. The only other similar forum post I could find on this was Master Account APIs vs. Account level APIs - API and Webhooks - Zoom Developer Forum, which from the answer points that yes hitting the /users api should return users across the master and subaccounts.