Is there any way to prevent users (with pro licenses) from creating workspaces? I'd like to limit the number of workspaces available in Power BI to only those created and managed by IT.
To the best of my knowledge, there is no tenant setting for that. Might make a good Idea.
Proud to be a Datanaut!
Update: This does not appear to be an option, but there is an open idea on this subject:
Please vote if this would be useful for you or your organization.
According to your description, you want to disable creating group for the users in your organization. Right?
Currently, Power BI group creation in Power BI is now controlled by the group creation in Exchange Online. You can use PowerShell script to disable it on Office 365. See: PREVENT USERS FROM CREATING GROUPS IN OFFICE 365.