Is there a way to obtain all users' sids in an organization?
I assume this is the user's unique id?
Enterprise and self hosted customers have the ability to manage their own user database. However, if you are cloud-hosted you do not have this ability. Instead, the best "work-around" would be to create a table that stores user information including their sid. You would trigger a query every time the page refreshes to collect that information about the user, check to see if it already exists in the database and then add the user information if is does not.
The second solution is a little hacky, but should get the job done 