Anyone knows details?:
..In an enterprise environment, ArcGIS License Manager can also host and distribute enterprise single-use licenses or ArcGIS Pro named user licenses via a Portal for ArcGIS instance.
If your organization uses Portal for ArcGIS rather than ArcGIS Online, you can download an ArcGIS Pro license entitlement file from My Esri, import this to the License Manager, and then export a file to Portal for ArcGIS. Once the ArcGIS Pro entitlements are in the Portal, the Administrator can manage them just as is done in ArcGIS Online.
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