Hi.
You are correct that you can get your Team license history, but it is in bulk--not separated by user. This is a known current limitation of this API; it can only read the owning organization but not the individual member. It is on our road map to include all of this information in the API, but we don't have an ETA at this time.
Further, there is also a current limitation on the License History page that does not allow Teams to download a CSV report. At this time, that is only something that Enterprise customers can do.
There is work being done on the License History page to be more useful to all users, so I would expect some kind of update in the coming months, but cannot verify if CSV export is part of that work (for Teams and Individuals).
I would recommend that if departmental control is a requirement, that you seriously consider upgrading to a Stock Enterprise offer. In addition to more granular license history (again, only visible in the CSV or License History page), it can allow you to set separate quotas per team, assign permissions (e.g., allow group A to license everything and group B to only license images), and require additional metadata when licensing the asset, such as client name/PO number/etc.
If you'd like to discuss your use case in more depth, feel free to drop us a line at stockapis@adobe.com.
Thanks!
Christopher