Player Authentication Admin

Hi, I have been using Unity’s Cloud Code Services to access different Unity Game Services. I have been successful so far. Now I have to implement Add Friends functionality inside Friends UGS. But I have to create a system where users can search other users’ names and send friend request to them by Id or Name. For searching through users I started trying this API :

https://services.docs.unity.com/player-auth-admin/v1/#section/Introduction
https://services.docs.unity.com/player-auth-admin/v1/#tag/Player-Authentication-Admin/operation/ListPlayers

Whenever I try to hit this API it always return this error : https://ibb.co/RpWBXQv![](https://ibb.co/ZTSFQxZ)

I have added essential permissions in Service Account and also setup everything according to docs. My basic authorization token is also set as seen in picture.

No worries i found the solution I was creating Post request but it needed Get request.

You are going to list all players, page by page, via that API in order to search for a particular player every time this feature is used? What if there are millions of players?