HTTP GET to "https://ip_address/mgmt/shared/authz/users" from LTM admin account produces nearly empty user response

Hi,

I am attempting to follow the instructions found here: https://devcentral.f5.com/questions/big-ip-1161-icontrol-rest-api-access-issues-47605 (Answer 1).

Prior to running the HTTP PATCH to update the list of authorized REST API users, I just want to validate that the user I created through the UI is properly showing up, so I run the command shown in step 2:

2.GET to /mgmt/shared/authz/users to verify that the user shows up in the users 

Although this should produce a hash with an array of items, the items array is blank. Not only is my newly created user not there, but I don't even see the admin account or any other accounts.

Here is the response I receive:

{"items":[],"generation":0,"kind":"shared:authz:users:userscollectionstate","lastUpdateMicros":0,"selfLink":"https://localhost/mgmt/shared/authz/users"}

Perhaps I shouldn't be querying against authz but something else? Authentication is being performed through AD and authorization is being handled on the LTM.

Any help is greatly appreciated. Thanks!