[Bacardi]

You should check after admin check callback.
To mess too much with admin privilege.

*edit
You could mention what game ? Maybe all games not support 'AuthId_Steam3'

PHP Code:

#include <steamworks>



public void OnClientPostAdminCheck(int client)
{
/*
    Called once a client is authorized and fully in-game, and after all post-connection authorizations have been performed.
    This callback is guaranteed to occur on all clients, and always after each OnClientPutInServer() call.
*/

    if(IsFakeClient(client)) return;

    // https://steamcommunity.com/groups/CrowbarTool
    SteamWorks_GetUserGroupStatus(client, 103582791434761767);
}


public int SteamWorks_OnClientGroupStatus(int authid, int groupid, bool isMember, bool isOfficer)
{
    char sauthid[20];
    Format(sauthid, sizeof(sauthid), "%i", authid);

    char steamid[20];
    int client = 0;
    
    for(int i = 1; i <= MaxClients; i++)
    {
        if(!IsClientInGame(i) || IsFakeClient(i)) continue;
        
        if(!GetClientAuthId(i, AuthId_Steam3, steamid, sizeof(steamid))) continue;
        
        if(StrContains(steamid, sauthid, false) == -1) continue;
        
        client = i;
        break;
    }

    if(client == 0) return; // Client not in game anymore

    // Already in admin cache
    if(GetUserAdmin(client) != INVALID_ADMIN_ID)
    {
        if(isMember) return;
        if(isOfficer) return;
        
        // Client is admin, but not in group member
        // Do code here
        PrintToServer("%N is admin but not in group member", client);
    }
    else if(isMember)
    {
        // Client not admin, but is member
        // Do code here
        PrintToServer("%N is not admin but in group member", client);
    }


}