Session quota limits not applied when using trees

Bug description

Session quota limits are not applied when authenticating via trees, only via chains/modules.

How to reproduce the issue

Details steps outlining how to recreate the issue (remove this text)

1. Global Services, Session, Session Quotas, set Enable Quota Constraints
2. Set Resulting behavior if session quota exhausted to be DENY_ACCESS
3. Go to Realm, add Session service and set Active User Sessions to 2
4. Log in via Example tree 3 separate times (ie incognito windows) and check the sessions are created via Admin console

Expected behaviour

User sees a message saying "You've reached your session limit"

Current behaviour

User able to login normally

Work around

Log in via chains/modules.