Per Case # 09826864
"There is currently no CSV-based method to update an existing user's Seat Type in bulk. The only supported way to change Seat Type for existing users is through the Seat Types & True-Up page, using Bulk Actions > Change Seat Type."
This feature would be useful for implementations / change management scenarios where we need a documented rollback plan and a way to revert the system to its pre-Changed state. For example, we are implementing SCIM to take over from manual licensing, and while we are going to download an existing user report, it would be much more reassuring to know that we could roll back to the pre-change state with a single upload rather than having to go through the report line by line and verify nearly a thousand users.
That this feature already exists for User Roles & Reports and the template includes the Seat Type as a field, but it's not supported, is both confusing and disappointing.