AppDynamics REST API troubleshooting with external service account

We are using AppDynamics for some APM monitoring and now they want to use an extension that utilizes REST API to query for statistics. From an authentication standpoint we use Cisco ISE, so I created a service account and gave it admin permissions. I used the username password to log into the gui and have full access. Part of the procedure to implement this AppDynamics extension is to run https:///mgmt/tm/ltm/pool/stats and you should get pool information. If I use that and log in with the local admin account it works, but if I use the ISE service account it doesn't. Has anyone used this or something similar using an external TACACS account? I saw that I could use tokens or some other methods possibly but I would prefer to do what I am, and it feels like I am close.